Basic Science Orthopaedic Topics

Anatomy, biomechanics & pathology. 160 evidence-informed references covering conditions, classifications, management and high-yield exam notes for FRCS (Tr&Orth), FRACS, EBOT and ABOS preparation.

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Abductor Digiti Minimi - Anatomy and Clinical RelevanceComprehensive guide to the abductor digiti minimi muscle anatomy, innervation, blood supply, function, and clinical relevance for orthopaedic examinations
Adult-Onset Still's DiseaseFellowship-level guide to adult-onset Still's disease (AOSD) - a systemic autoinflammatory disorder of the IL-1/IL-18 axis presenting with the classic tetrad of daily (quotidian) spiking fever, an evanescent salmon-pink rash, arthralgia/arthritis and a strikingly high ferritin - covering the Yamaguchi diagnostic criteria, AOSD as a diagnosis of exclusion (mimicking sepsis, malignancy and other rheumatic disease), its feared complication of macrophage activation syndrome, the orthopaedic relevance (chronic arthritis, notably carpal/wrist ankylosis), and management from NSAIDs/steroids to IL-1/IL-6 biologics.
Apoptosis and Cell Death in OrthopaedicsFellowship-level guide to apoptosis (programmed cell death) for orthopaedic exams: the contrast with necrosis, the intrinsic (mitochondrial, Bcl-2/cytochrome c/caspase-9) and extrinsic (death-receptor/caspase-8) pathways converging on executioner caspases, and its orthopaedic relevance - growth-plate chondrocyte apoptosis in endochondral ossification, interdigital apoptosis, and chondrocyte/osteocyte apoptosis in osteoarthritis and osteonecrosis.
Articular Cartilage Structure and FunctionComprehensive guide to articular cartilage structure, composition, zonal organization, and biomechanical properties for basic science viva preparation
Bending Moment Distribution in Fracture FixationBending mechanics, stress distribution, neutral axis, working length, and clinical applications in fracture fixation
Biceps Femoris Short Head AnatomyDetailed anatomy of the Short Head of Biceps Femoris, the only hamstring muscle that does NOT cross the hip joint, including its unique innervation and clinical significance.
Bioabsorbable & Magnesium (Biodegradable Metal) ImplantsFellowship-level guide to biodegradable metal implants - chiefly magnesium-based devices (and zinc/iron alloys) that resorb after fulfilling their fixation role - covering why they are attractive (an elastic modulus close to bone reducing stress shielding, biocompatibility and osteoconductivity/pro-osteogenic effects, no removal surgery, less imaging artefact than titanium/steel), the main limitation of controlling corrosion/degradation and hydrogen-gas evolution, the radiological evolution that can mimic complications, and current clinical use (e.g. the MAGNEZIX magnesium compression screw in foot/ankle) - distinct from the bioabsorbable polymers covered elsewhere.
Bioabsorbable MaterialsComprehensive guide to bioabsorbable implants for FRCS examination
Biofilm Formation in Orthopaedic InfectionsComprehensive guide to bacterial biofilm formation, structure, antimicrobial resistance mechanisms, and clinical implications for prosthetic joint infections and implant-related infections
BisphosphonatesExam-focused guide to bisphosphonates in orthopaedics: mechanism of action, classes and potency, indications, dosing, evidence for fracture prevention, and the key complications (atypical femoral fracture, osteonecrosis of the jaw) plus the drug holiday concept.
Blood Management StrategiesComprehensive exam-ready guide to perioperative blood management - preoperative optimization, tranexamic acid, cell salvage, transfusion thresholds, and massive transfusion protocols
Bone Composition and StructureComprehensive guide to bone composition, hierarchical organization, mineral and organic matrix components for basic science viva preparation
Bone Healing and Fracture BiologyComprehensive guide to primary and secondary bone healing, cellular mechanisms, growth factors, and factors affecting fracture union for FRCS examination
Bone Morphogenetic Proteins (BMPs)Comprehensive guide to bone morphogenetic proteins, signaling pathways, clinical applications, and osteoinductive properties for basic science viva preparation
Bone RemodelingComprehensive guide to bone remodeling physiology, BMU function, coupling mechanisms, and regulation for basic science viva preparation
Bone Signaling Pathways (Wnt, RANK-RANKL-OPG, BMP/TGF-β, Hedgehog, Notch)Fellowship-level basic-science guide to the molecular pathways that control bone: the RANK-RANKL-OPG axis of osteoclastogenesis, Wnt/β-catenin and its sclerostin brake, BMP/TGF-β in osteoblast differentiation, and the Hedgehog and Notch pathways - with the drugs (denosumab, romosozumab, BMP-2) that target them.
Calcific Periarthritis & Hydroxyapatite Deposition Disease (HADD)Fellowship-level guide to hydroxyapatite crystal deposition disease (HADD) and calcific periarthritis - deposition of basic calcium phosphate (hydroxyapatite) crystals in periarticular soft tissues (tendons, bursae, capsule, ligaments) producing calcific tendinopathy (classically of the rotator cuff), acute crystal-induced 'periarthritis' attacks, and occasionally destructive arthropathy (Milwaukee shoulder) - covering the radiographic amorphous calcification, the resorptive-phase acute attack, the differential from gout/CPPD, and management from conservative care to ultrasound-guided barbotage.
Calcium HomeostasisExam-focused guide to calcium homeostasis and metabolic bone disease: the PTH, vitamin D and calcitonin axis, the roles of bone, gut and kidney, and the diagnosis and management of osteoporosis, osteomalacia and rickets, hyperparathyroidism, renal bone disease and Paget disease.
Calcium Phosphate CementsComprehensive guide to calcium phosphate cements for FRCS examination
Cartilage Healing and RepairComprehensive guide to articular cartilage healing biology, repair mechanisms, and surgical interventions including microfracture, osteochondral grafts, and cell-based therapies for FRCS exam preparation
Cellular & Molecular Biology Basics for OrthopaedicsFellowship-level basic-science primer for orthopaedics: the eukaryotic cell and its organelles, the cell cycle and its controls, the central dogma (DNA to RNA to protein), collagen synthesis as the orthopaedic exemplar, cell death (apoptosis vs necrosis), and cell signalling - with the musculoskeletal relevance of each.
Ceramic Bearing Surfaces in ArthroplastyAlumina and zirconia ceramics in total joint replacement: structure, properties, wear characteristics, fracture risk, and clinical outcomes
Chondrocyte Metabolism and Cartilage HomeostasisMetabolic pathways, nutrition, and regulatory mechanisms in articular cartilage cells
Chondromyxoid FibromaRare benign cartilaginous tumor with characteristic lobular myxoid matrix and eccentric metaphyseal location
Clinical Practice GuidelinesComprehensive guide to clinical practice guidelines including development methodology, GRADE system, implementation, and critical appraisal in orthopaedic surgery.
Cobalt Chrome AlloysComprehensive guide to cobalt chrome alloys for FRCS examination
Common Pathogens in Orthopaedic InfectionsComprehensive guide to bacterial pathogens in orthopaedic infections including osteomyelitis, septic arthritis, and surgical site infections with antimicrobial susceptibility patterns
Common Statistical TestsComprehensive guide to common statistical tests in orthopaedic research including t-tests, ANOVA, chi-square, and regression, with guidance on test selection.
Composite Materials and PEEK in OrthopaedicsFellowship-level guide to composite biomaterials and PEEK: what a composite is (matrix plus reinforcement, e.g. carbon-fibre-reinforced PEEK; bone itself as a natural composite), the properties of polyetheretherketone (PEEK) - an elastic modulus close to bone, radiolucency and biocompatibility - its bioinert limitation requiring surface modification, and its orthopaedic uses (interbody cages, trauma plates).
Corrosion Mechanisms in Orthopaedic ImplantsTypes of corrosion, electrochemistry, metal ion release, ALVAL, and clinical implications for orthopaedic implants
CorticosteroidsExam-focused guide to corticosteroids in orthopaedics: how they work, the difference between systemic and intra-articular use, the major musculoskeletal side effects (glucocorticoid-induced osteoporosis, osteonecrosis of the femoral head, tendon and soft-tissue effects), the evidence on intra-articular steroid injections, and the practical rules for safe use around surgery.
Deep Vein ThrombosisComprehensive exam-ready guide to DVT diagnosis and treatment in orthopaedic patients - Wells score, D-dimer interpretation, ultrasound, anticoagulation protocols, and a side-by-side global guideline comparison
Delirium PreventionComprehensive guide to delirium prevention, risk assessment, HELP protocol, and perioperative management for orthopaedic fellowship examinations
DenosumabExam-focused guide to denosumab in orthopaedics: the RANKL mechanism, how it differs from bisphosphonates, indications in osteoporosis and giant cell tumour of bone, dosing, the evidence for fracture prevention, and the critical rebound vertebral fracture risk after stopping plus the complications of hypocalcaemia, osteonecrosis of the jaw, and atypical femoral fracture.
Dermatomyositis & Polymyositis (Idiopathic Inflammatory Myopathies)Fellowship-level guide to the idiopathic inflammatory myopathies - dermatomyositis and polymyositis (and juvenile dermatomyositis) - autoimmune diseases of symmetric proximal muscle weakness with a raised creatine kinase, characteristic skin signs in dermatomyositis (heliotrope rash, Gottron's papules), and important systemic associations (interstitial lung disease and, in adults, occult MALIGNANCY) - covering diagnosis (myositis-specific antibodies, EMG, MRI, biopsy), the calcinosis of juvenile disease, and management with corticosteroids/immunosuppression and IVIG, framed around the orthopaedic relevance of weakness, contracture and calcinosis.
Diagnostic Test Statistics: Sensitivity, Specificity, PPV/NPV, Likelihood Ratios & ROCFellowship-level biostatistics guide to interpreting diagnostic tests: the 2x2 table, sensitivity and specificity (with SnNout/SpPin), the prevalence-dependence of PPV and NPV, likelihood ratios and post-test probability, and the ROC curve and AUC - worked with real orthopaedic examination data.
Dialysis-Related Amyloid Arthropathy (Beta-2 Microglobulin)Fellowship-level guide to dialysis-related amyloidosis - deposition of beta-2 microglobulin amyloid in the osteoarticular tissues of long-term (especially long-vintage) haemodialysis patients - presenting with carpal tunnel syndrome, a chronic shoulder/large-joint arthropathy, flexor tenosynovitis/trigger fingers, destructive (erosive) spondyloarthropathy and subchondral bone cysts that predispose to pathological fracture - covering the pathophysiology (impaired beta-2 microglobulin clearance), the radiographic cysts, the reduced incidence with modern high-flux/ultrapure dialysis, and management (surgery for compression/instability; transplantation removes the source and relieves symptoms but does not clear established deposits).
Distraction OsteogenesisPrinciples and biology of bone lengthening through gradual distraction and the tension-stress effect
Dysbaric Osteonecrosis (Caisson Disease)Evidence-based guide to dysbaric osteonecrosis: how nitrogen bubbles from decompression cause bone death in divers and compressed-air workers, its juxta-articular and shaft patterns, MRI and radiographic diagnosis, classification, and stage-directed management
Electrical Stimulation and Bone Healing (Direct/Capacitive/Inductive Coupling)Fellowship-level guide to electrical and electromagnetic bone-growth stimulation: the piezoelectric/stress-generated-potential rationale, the three modalities (invasive direct current, non-invasive capacitive coupling, and inductive coupling/pulsed electromagnetic field), their mechanisms and indications (non-union, delayed union, spinal fusion, osteonecrosis), and the device-specific, compliance-dependent evidence.
Electrosurgery, Diathermy & Surgical Energy DevicesFellowship-level guide to electrosurgery (diathermy) and surgical energy devices for the orthopaedic surgeon - how high-frequency alternating current cuts and coagulates tissue, the difference between monopolar (current passes through the patient to a return/dispersive electrode) and bipolar (current confined between forceps tips) diathermy, cut versus coagulation/blend waveforms, and the safety essentials (correct return-electrode placement, pacemaker/ICD precautions, alternative-site burns, surgical-fire risk and surgical-smoke hazards) - plus the principles of harmonic (ultrasonic) and advanced bipolar/RF/microwave devices.
Enhanced Recovery After Surgery (ERAS) ProtocolsComprehensive guide to ERAS protocols in orthopaedic surgery - evidence-based perioperative optimization, multimodal analgesia, early mobilization for exam preparation
Epigenetics in Musculoskeletal DiseaseFellowship-level guide to epigenetics in musculoskeletal disease - heritable, potentially reversible changes in gene expression without alteration of the DNA sequence (DNA methylation, histone modification and non-coding RNAs such as microRNAs) - covering how epigenetic dysregulation contributes to osteoarthritis, osteoporosis and bone tumours, the concept of epigenetic clocks/ageing as biomarkers of degenerative musculoskeletal disease, and the emerging diagnostic and therapeutic (and regenerative) implications, framed for the orthopaedic exam.
Evidence-Based Orthopaedics and Critical AppraisalAdvanced orthopaedic guide to evidence-based practice and critical appraisal: PICO, study design, bias, effect size, confidence intervals, applicability, reporting guidelines and journal-club decision-making.
Ewing SarcomaHighly malignant small round cell bone tumor affecting children and adolescents, requiring multimodal treatment with chemotherapy, surgery, and radiation
Extensor Digitorum Longus AnatomyComprehensive anatomy of extensor digitorum longus muscle including origin, insertion, neurovascular supply, clinical relations, and surgical considerations for lower limb procedures
Fatigue Failure in BiomaterialsMechanisms of cyclic loading failure, S-N curves, and endurance limits in orthopaedic implants
Foot Anatomy and Biomechanics (Arch, Windlass Mechanism, Gait Cycle)Fellowship-level basic-science guide to the functional anatomy and biomechanics of the foot: the hindfoot/midfoot/forefoot, the longitudinal and transverse arches and their bony, ligamentous (plantar fascia, spring ligament) and muscular supports, the WINDLASS mechanism, the subtalar/transverse-tarsal coupling that converts the foot from a flexible shock absorber to a rigid lever, and the phases of the gait cycle.
Fracture HealingComprehensive guide to fracture healing including primary and secondary healing, phases, biology, and factors affecting union.
Gait Cycle AnalysisComprehensive exam-focused review of Gait Cycle Analysis including clinical presentation, investigation, management, and key exam points
Gene Therapy and Tissue Engineering in OrthopaedicsFellowship-level guide to regenerative orthopaedics: the tissue-engineering triad (cells, scaffold, signals), clinical examples such as autologous chondrocyte implantation and BMP-loaded constructs, the principles of gene therapy (viral vs non-viral vectors, in vivo vs ex vivo), and the challenges of vector safety, vascularisation and translation.
General Anaesthesia for Orthopaedic SurgeryExam-focused guide to general anaesthesia in orthopaedics: the stages of a general anaesthetic, airway management and the difficult airway, induction and maintenance agents, the general versus regional anaesthesia debate for hip fracture, postoperative delirium, and the major complications every orthopaedic trainee must recognise.
Genetics & Modes of Inheritance in OrthopaedicsFellowship-level basic-science guide to inheritance patterns and the genetics of musculoskeletal disease: autosomal dominant (achondroplasia, OI, Marfan, MHE, NF1), autosomal recessive, X-linked and mitochondrial inheritance, plus key concepts (penetrance, anticipation, mosaicism) - with the genes examiners expect.
Glucocorticoid-Induced & Secondary OsteoporosisFellowship-level guide to secondary osteoporosis: when to suspect it, the causes to screen for, and the management of glucocorticoid-induced osteoporosis (GIOP) - mechanism, fracture-risk assessment and the 2022 ACR treatment algorithm (bisphosphonates, denosumab, anabolics).
Growth Factors in Bone HealingComprehensive guide to growth factors regulating bone healing, BMP family, VEGF, TGF-β, PDGF, FGF, IGF roles, clinical applications, and therapeutic controversies for basic science viva preparation
Haemochromatosis ArthropathyComprehensive guide to the arthropathy of hereditary haemochromatosis - iron-overload joint disease, the pathognomonic MCP hook osteophyte, links with CPPD, metabolic screening and orthopaedic management for fellowship exam preparation
Highly Crosslinked & Vitamin-E Polyethylene (Advanced Bearings)Fellowship-level guide to the polyethylene bearing in arthroplasty: why conventional UHMWPE wear and particle-induced osteolysis drive long-term failure, how highly crosslinked polyethylene (HXLPE) dramatically reduces wear (with strong hip registry evidence), the free-radical/oxidation trade-off of crosslinking, and the two stabilisation strategies - thermal treatment (remelting vs annealing) and vitamin-E (antioxidant) incorporation.
Hip Joint BiomechanicsComprehensive analysis of hip joint biomechanics including joint reaction forces, muscle moment arms, gait mechanics, stability mechanisms, and clinical applications in total hip arthroplasty and hip pathology.
HIV and the Musculoskeletal SystemComprehensive guide to musculoskeletal manifestations of HIV infection including HIV-associated arthropathy, septic arthritis, osteomyelitis risk, avascular necrosis, perioperative considerations, occupational exposure and PEP, and fracture healing.
HyperparathyroidismComprehensive guide to primary, secondary, and tertiary hyperparathyroidism - pathophysiology, bone effects, brown tumors, biochemistry, surgical indications for orthopaedic fellowship exams
Hypertrophic Osteoarthropathy (incl. Pachydermoperiostosis)Fellowship-level guide to hypertrophic osteoarthropathy (HOA) - the triad of digital clubbing, periostosis (periosteal new bone of the long bones) and arthralgia/joint effusions - in its primary form (pachydermoperiostosis, a genetic prostaglandin-pathway disorder, also with pachyderma/cutis verticis gyrata) and its far commoner secondary form (a paraneoplastic/systemic marker, classically of intrathoracic malignancy and suppurative lung disease) - covering recognition, the Schamroth sign, the bone scan/radiographic periostosis, and management directed at the underlying cause.
HypoparathyroidismComprehensive guide to hypoparathyroidism - etiology, pathophysiology, clinical presentation with tetany, biochemistry, orthopaedic manifestations, and perioperative management for fellowship exams
HypophosphatasiaFellowship-level guide to hypophosphatasia (HPP): an inherited ALPL/TNSALP deficiency causing impaired mineralization with the paradoxical LOW serum alkaline phosphatase, the age-related clinical spectrum (perinatal to adult/odonto), premature loss of primary teeth and poorly-healing fractures, the critical pitfall that BISPHOSPHONATES are contraindicated, and enzyme replacement with asfotase alfa.
Iatrogenic Nerve Injury & Positioning Injuries in Orthopaedic SurgeryFellowship-level guide to iatrogenic peripheral nerve injuries and intra-operative positioning injuries in orthopaedic surgery - the mechanisms (direct laceration, retraction/traction, compression, thermal, ischaemic and patient-positioning), the nerves most at risk by procedure (e.g. sciatic/femoral/superior gluteal/LFCN in hip surgery; ulnar at the elbow, common peroneal at the fibular neck, brachial plexus from positioning), strategies for prevention (positioning, padding, retractor discipline, limb-length awareness), and the recognition, work-up and management (and medico-legal framing) when a deficit occurs.
Immunology in Orthopaedics (Innate, Adaptive, HLA & Transplant Immunology)Fellowship-level guide to the immune system for orthopaedic exams: innate immunity (complement, phagocytes, NK cells) and adaptive immunity (T cells, B cells/antibodies, MHC/HLA antigen presentation and memory), the mechanisms and types of allograft rejection, and the orthopaedic application - why processed bone allografts are weakly immunogenic and not HLA-matched while fresh osteochondral allografts are more immunogenic.
Implant and Fracture BiomechanicsBiomechanical principles governing fracture fixation, implant design, and load sharing in orthopaedic surgery
Inferior Gluteal Nerve AnatomyFellowship-level guide to the inferior gluteal nerve: the sole motor nerve to gluteus maximus (L5-S2), its exit below piriformis through the greater sciatic foramen, its entry into the deep surface of gluteus maximus about 5 cm from the greater trochanter, the resulting hip-extension deficit and gluteus maximus lurch if injured, and its vulnerability in the posterior hip approach (the safe split rule).
Inflammation & Cytokines in Orthopaedics (TNF-α, IL-1, IL-6)Fellowship-level basic-science guide to inflammation and cytokines in musculoskeletal disease: the acute inflammatory response, the key pro-inflammatory cytokines (TNF-α, IL-1, IL-6, IL-17), osteoimmunology and how cytokines drive RANKL-mediated bone erosion, and the biologic drugs (anti-TNF, anti-IL-6, IL-1Ra) that target them.
Intervertebral Disc BiologyComprehensive overview of intervertebral disc anatomy, biomechanics, nutrition, and degeneration for Orthopaedic examination
Joint Reaction ForcesBiomechanical principles of joint reaction forces - calculation, magnitude across hip/knee/shoulder, and clinical implications for arthroplasty design
Knee BiomechanicsFundamental biomechanical principles of the knee joint including tibiofemoral mechanics, patellofemoral tracking, ligament function, and clinical implications
Landmark TrialsAdvanced orthopaedic guide to landmark trials across trauma, sports, arthroplasty, spine and paediatrics, including DRAFFT, PROFHER, FLOW, FAITH, HEALTH, FORCE, KANON, METEOR, FIDELITY, MOON, CRISTAL, EPCAT II and SPORT.
Lateral Antebrachial Cutaneous Nerve AnatomyFellowship-level guide to the lateral antebrachial cutaneous nerve (LABCN/LACN): the terminal sensory continuation of the musculocutaneous nerve that emerges lateral to the biceps tendon at the elbow (deep to the cephalic vein) to supply the lateral forearm; its course, the clinical vulnerability during distal biceps repair and antecubital venepuncture, and how its injury presents and is distinguished from other neuropathies.
Levels of EvidenceComprehensive guide to levels of evidence framework including GRADE, Oxford CEBM, and application to orthopaedic decision-making.
Ligament BiologyComprehensive review of ligament structure, composition, biomechanics, healing, and graft biology for orthopaedic surgery exams
Ligament HealingComprehensive guide to ligament healing phases, biology, and factors affecting repair for FRCS exam preparation
Local AnaestheticsExam-focused guide to local anaesthetics in orthopaedics: how they block sodium channels, the amide versus ester classes, onset and duration, maximum safe doses with and without adrenaline, why infected tissue is hard to anaesthetise, the role of liposomal bupivacaine, and how to recognise and treat local anaesthetic systemic toxicity (LAST) with lipid emulsion.
Local Antibiotic Delivery SystemsComprehensive review of local antibiotic delivery methods including PMMA beads, calcium sulfate, and bioabsorbable carriers for orthopaedic infection management
Malignant HyperthermiaComprehensive guide to malignant hyperthermia: RYR1-mediated hypermetabolic crisis triggered by volatile anaesthetic agents and suxamethonium, covering pathophysiology, clinical recognition, dantrolene management, and relevance to orthopaedic anaesthesia.
Measures of Effect: Odds Ratio, Relative Risk, NNT & Effect SizeFellowship-level biostatistics guide to measures of effect: relative risk, odds ratio, absolute and relative risk reduction, number needed to treat, hazard ratio, effect size and confidence intervals - how to calculate, interpret and tell them apart, worked with real orthopaedic trial data.
Medication-Related Osteonecrosis of the Jaw (MRONJ)Exam-focused guide to medication-related osteonecrosis of the jaw (MRONJ): definition, staging (AAOMS), risk with bisphosphonates and denosumab, why dental extractions trigger it, radiographic features, prevention, conservative versus surgical management, and the key viva distinctions between exposed bone, infection, and pathologic fracture.
Meniscus Structure and FunctionComprehensive overview of meniscal anatomy, biomechanics, and clinical significance for Orthopaedic examination
Moment Arms and Levers in Musculoskeletal BiomechanicsFundamental principles of moment arms, lever systems, and mechanical advantage in the musculoskeletal system. Essential biomechanics for understanding force transmission, joint mechanics, and clinical applications in orthopaedic surgery.
Multimodal AnalgesiaComprehensive guide to multimodal analgesia principles, drug classes, protocols, and perioperative pain management for orthopaedic surgery
Muscle Injury and HealingComprehensive guide to skeletal muscle injury classification, healing phases, regeneration biology, and rehabilitation principles for Orthopaedic examination preparation
Muscle PhysiologyComprehensive review of skeletal muscle structure, contraction mechanisms, fiber types, motor unit physiology, and biomechanical properties essential for orthopaedic practice
Needlestick and Sharps InjuryExam-focused guide to occupational needlestick and sharps injury in surgery: why orthopaedics is high risk, the per-injury transmission risk of hepatitis B, hepatitis C and HIV, what to do the moment you are stuck (first aid, risk assessment, source testing, post-exposure prophylaxis), and how double gloving, blunt needles and a no-touch technique prevent it.
Nerve Anatomy and PhysiologyComprehensive guide to nerve structure, fiber classification, action potential physiology, nerve injury patterns, and regeneration for basic science viva preparation
Nerve Injury and RegenerationComprehensive guide to peripheral nerve injury classification, Wallerian degeneration, chromatolysis, Schwann cell biology, axonal regeneration and factors affecting nerve repair for basic science viva preparation
NSAIDs in OrthopaedicsStudent-first guide to non-steroidal anti-inflammatory drugs (NSAIDs) in orthopaedics: how COX-1 and COX-2 inhibition works, COX-2 selective versus non-selective agents, the gastrointestinal, renal, cardiovascular and bleeding side effects, the controversy over fracture healing, and the evidence for NSAIDs in heterotopic ossification prophylaxis and multimodal analgesia.
Ochronosis (Alkaptonuria Arthropathy)Homogentisic acid accumulation, ochronotic pigment deposition, and the spine-first arthropathy of alkaptonuria
Orthopaedic Antibiotic TherapyExam-focused guide to antibiotic therapy for bone and joint infection: how antibiotics work, the agents and their bone penetration, biofilm and the role of rifampicin, route and duration of treatment, and the high-yield evidence from OVIVA, the Zimmerli rifampicin trial, and open-fracture data.
Orthopaedic Surgical InstrumentsExam-focused guide to the orthopaedic instrument set: how to group the basic instruments (cutting, holding, retracting, bone-handling, power), how each is designed to do its job, the principles behind safe drilling and sawing (thermal necrosis), why sharps and power tools matter for infection and sharps injury, and how instruments are decontaminated and laid out - the practical knowledge basic-science and operative vivas test.
OsseointegrationComprehensive guide to osseointegration mechanisms, surface modifications, implant stability, and clinical applications in orthopaedic surgery
Ossification: Intramembranous and EndochondralUnderstanding the two pathways of bone formation during development and fracture healing
Osteoarthritis PathophysiologyMolecular and cellular mechanisms of cartilage degeneration, subchondral bone changes, and synovial inflammation in OA
Osteoblasts and Bone FormationComprehensive guide to osteoblast biology, differentiation, bone matrix synthesis, and regulation for basic science viva preparation
OsteochondromaBenign cartilage-capped bone lesion, most common benign bone tumor
Osteoclasts and Bone ResorptionUnderstanding osteoclast function, regulation, and clinical implications in bone metabolism and pathology
Osteocytes and MechanotransductionCellular mechanisms of bone mechanosensing and the role of osteocytes in bone homeostasis and adaptation
OsteomyelitisComprehensive review of osteomyelitis pathophysiology, microbiology, classification, and evidence-based management for orthopaedic fellowship examinations
Outcome Measures and PROMsComprehensive guide to outcome measures and Patient-Reported Outcome Measures (PROMs) in orthopaedic surgery including WOMAC, DASH, SF-36, and joint-specific scores.
Outpatient / Same-Day / Rapid-Recovery ArthroplastyFellowship-level guide to outpatient and rapid-recovery joint arthroplasty: the enhanced-recovery (ERAS) bundle that makes same-day discharge possible, the patient-selection criteria that keep it safe, the evidence on success and complication rates, and the causes and risk factors for same-day-discharge failure.
P-Values and Confidence IntervalsComprehensive guide to understanding p-values, confidence intervals, statistical significance, and clinical interpretation in orthopaedic research.
Paget's Disease of BoneComprehensive guide to Paget's disease - pathophysiology, biochemical markers, radiology, orthopaedic complications, medical and surgical management for fellowship exams
Perioperative Antibiotic ProphylaxisComprehensive guide to surgical antibiotic prophylaxis in orthopaedic surgery including timing, agent selection, dosing, duration, and evidence-based protocols
Perioperative Anticoagulation ManagementComprehensive exam-ready guide to perioperative anticoagulation management in orthopaedic surgery - warfarin, DOACs, heparin bridging, and bleeding risk stratification
Phantom Limb Pain and Amputation PainComprehensive guide to phantom limb pain, residual limb pain and stump neuroma pain after amputation, including cortical reorganisation, prevention strategies and multimodal management.
Physis (Growth Plate): Anatomy & PhysiologyFellowship-level basic-science guide to the physis: the four histological zones (resting, proliferative, hypertrophic, provisional calcification), the dual blood supply, the perichondral ring of LaCroix and groove of Ranvier, the PTHrP-Ihh feedback loop, and why the hypertrophic zone is the plane of Salter-Harris failure.
Platelet-Rich Plasma (PRP) & OrthobiologicsFellowship-level guide to PRP and orthobiologics: what PRP is and the growth factors it delivers, how it is prepared and classified (leukocyte-rich vs leukocyte-poor, PAW/Mishra), the level-1 evidence in knee osteoarthritis and tendinopathy, and the wider orthobiologics landscape (BMAC, MSCs, ACS) with its big caveat - lack of standardisation.
PMMA Bone CementComprehensive guide to bone cement for FRCS examination
Polyethylene in Arthroplasty: UHMWPE and XLPEUltra-high molecular weight polyethylene (UHMWPE) and highly crosslinked polyethylene (XLPE) bearing surfaces: structure, manufacturing, wear properties, and clinical outcomes
Preoperative Medical OptimizationComprehensive exam-focused review of Preoperative Medical Optimization including clinical presentation, investigation, management, and key exam points
Proteoglycans and Collagen in Connective TissueComprehensive guide to proteoglycan and collagen structure, function, biosynthesis, and clinical significance in orthopaedic tissues
Pseudohypoparathyroidism (Albright Hereditary Osteodystrophy)Fellowship-level guide to pseudohypoparathyroidism (PTH resistance) and Albright hereditary osteodystrophy: the GNAS/Gs-alpha defect and parent-of-origin imprinting (PHP1a vs pseudo-pseudohypoparathyroidism), the biochemical triad of hypocalcaemia + hyperphosphataemia + HIGH PTH, the AHO phenotype with short 4th/5th metacarpals (the metacarpal sign), and management with calcium and active vitamin D.
Pulmonary EmbolismComprehensive exam-ready guide to pulmonary embolism in orthopaedic patients - PERC rule, Wells criteria, CTPA diagnosis, risk stratification (massive/submassive/low-risk), thrombolysis, and prevention
Pulmonary Risk AssessmentComprehensive perioperative pulmonary risk assessment including OSA screening, COPD optimization, postoperative pulmonary complication prediction, and management strategies
Radiculopathy vs Peripheral Nerve LesionComprehensive guide to differentiating nerve root (radiculopathy) from peripheral nerve and plexus lesions using dermatomal vs peripheral nerve territory mapping, myotome patterns, reflex changes, and electrodiagnostic findings.
Regional Anaesthesia TechniquesComprehensive guide to regional anesthesia blocks including neuraxial, upper and lower extremity peripheral nerve blocks, ultrasound guidance, LAST management, and perioperative considerations for orthopaedic exam
Relapsing PolychondritisFellowship-level guide to relapsing polychondritis - a rare, immune-mediated disease of recurrent inflammation and progressive destruction of cartilage (auricular, nasal, laryngotracheal and articular) with systemic involvement - covering the hallmark bilateral auricular chondritis with sparing of the non-cartilaginous earlobe, the life-threatening laryngotracheal disease, the seronegative non-erosive arthritis, the diagnostic criteria (McAdam/Michet), associations (including ANCA-associated vasculitis and myelodysplasia/VEXAS), and management with corticosteroids and immunosuppression.
Reliability and Validity (Kappa, ICC, Bland-Altman)Fellowship-level guide to reliability and validity in orthopaedic research: the distinction (precision vs accuracy), intra- and inter-observer reliability, Cohen's/Fleiss' kappa for categorical agreement (with the Landis-Koch interpretation), the intraclass correlation coefficient for continuous data, the Bland-Altman plot for method comparison, why correlation is not agreement, and the validity types - applied to fracture classifications and outcome measures.
Sarcoidosis - Musculoskeletal ManifestationsFellowship-level guide to the musculoskeletal manifestations of sarcoidosis - a multisystem non-caseating granulomatous disease - covering acute sarcoid arthropathy (Lofgren syndrome: ankle periarthritis + erythema nodosum + bilateral hilar lymphadenopathy, usually self-limiting) versus chronic arthritis, granulomatous myopathy (often clinically silent), osseous sarcoidosis (classically lace-like lytic lesions of the hands/feet phalanges), and the indirect skeletal effects of hypercalcaemia/osteoporosis - with the role of MRI, the differential, and management directed at the systemic disease.
Sclerosing Bone Dysplasias (Osteopetrosis, Pycnodysostosis, Osteopathia Striata, Sclerosteosis/Van Buchem)Fellowship-level guide to the sclerosing bone dysplasias - a group of genetic disorders of increased bone density classified by the bone-formation pathway affected: dysplasias of endochondral bone (osteopetrosis, pycnodysostosis, osteopoikilosis, osteopathia striata, enostosis), of intramembranous bone (Camurati-Engelmann diaphyseal dysplasia; Van Buchem disease and sclerosteosis), and mixed (melorheostosis) - covering the radiographic patterns, the key clinical pitfalls (brittle dense bone, marrow failure, cranial-nerve compression), and orthopaedic management including the challenges of fracture fixation in dense bone.
Screw BiomechanicsComprehensive guide to screw biomechanics including screw anatomy, pullout strength, lag screw technique, and locking versus non-locking screws for basic science viva preparation
Septic ArthritisComprehensive review of septic arthritis pathophysiology, diagnosis, and urgent management for orthopaedic fellowship examinations
Seronegative Spondyloarthropathy (Overview)Fellowship-level overview of the seronegative spondyloarthritides: the HLA-B27-associated family (ankylosing spondylitis/axial SpA, psoriatic, reactive, enteropathic, juvenile), their shared features (enthesitis, dactylitis, inflammatory back pain, extra-articular manifestations), diagnosis, the IL-17/23 gut-joint biology, treatment ladder, and the orthopaedic hazard of the ankylosed spine.
Shoulder BiomechanicsFundamental biomechanical principles of the glenohumeral joint including stability mechanisms, rotator cuff function, scapulothoracic motion, and force couples
Sjogren Syndrome - Musculoskeletal ManifestationsFellowship-level guide to the musculoskeletal manifestations of Sjogren syndrome - a chronic autoimmune exocrinopathy (dry eyes and mouth from lymphocytic infiltration of lacrimal and salivary glands) - covering its very common arthralgia and a usually non-erosive inflammatory arthritis, the overlap with rheumatoid arthritis and other connective-tissue disease (primary vs secondary Sjogren), the myalgia/inflammatory myopathy, and the orthopaedic relevance of a seropositive (anti-Ro/anti-La) systemic disease behind joint symptoms, with management directed at symptoms and the systemic disease.
Skeletal Fluorosis & Other Toxic Osteopathies (Hypervitaminosis A/D, Aluminium Bone Disease)Fellowship-level guide to the toxic osteopathies - principally skeletal fluorosis (chronic excess fluoride causing dense osteosclerosis, ligament/interosseous-membrane ossification and paradoxically fragile, low-quality bone), together with hypervitaminosis A (cortical hyperostosis/periostosis and bone pain), hypervitaminosis D (hypercalcaemia and metastatic calcification) and aluminium-related (renal osteodystrophy) bone disease (a low-turnover osteomalacia) - covering recognition on imaging, the diagnostic pitfall of 'dense but weak' bone, the surgical implications, and management by removing the toxin.
Smoking CessationComprehensive guide to perioperative smoking cessation - impact on orthopaedic outcomes, timing, pharmacotherapy, and counseling strategies for exam preparation
Spinal BiomechanicsFundamental biomechanical principles of the spine including motion segments, load distribution, and clinical implications for surgical practice
Spinal Cord & Vertebral Column Vascular Anatomy (Artery of Adamkiewicz)Fellowship-level guide to the blood supply of the spinal cord: the single anterior spinal artery (anterior two-thirds) and paired posterior spinal arteries (posterior third), the segmental radiculomedullary feeders and the dominant artery of Adamkiewicz, the thoracic watershed, and anterior spinal artery (anterior cord) syndrome relevant to spine deformity and aortic surgery.
Statistical Power and Sample SizeComprehensive guide to statistical power, sample size calculation, and ensuring adequate study design for detecting clinically meaningful differences.
Stem Cells & Mesenchymal Stromal Cells (MSCs) in OrthopaedicsFellowship-level basic-science guide to stem cells in orthopaedics: stem-cell hierarchy, the ISCT definition of mesenchymal stromal cells, their sources (bone marrow, adipose, umbilical cord), trilineage differentiation, the paracrine/immunomodulatory mechanism of action, clinical applications (BMAC, cartilage, nonunion) and the regulatory and evidence caveats.
Stress ConcentrationGeometric discontinuities creating localized stress elevation and their role in implant failure
Stress, Strain, and Elastic ModulusFundamental material properties, stress-strain relationships, elastic modulus, and mechanical testing principles
Study Design TypesComprehensive guide to research study designs including RCTs, cohort studies, case-control studies, and observational designs used in orthopaedic research.
Surgical Site Infection Prevention (Perioperative)Evidence-based strategies for preventing surgical site infections in orthopaedic surgery including antibiotic prophylaxis, skin preparation, sterile technique, and perioperative optimization protocols
Survival Analysis (Kaplan-Meier, Cox Regression, Implant Survivorship)Fellowship-level guide to survival (time-to-event) analysis in orthopaedics: censoring, the Kaplan-Meier estimator and survivorship curves, the log-rank test, Cox proportional-hazards regression and the hazard ratio, the importance of endpoint definition, and the competing risk of death that can make Kaplan-Meier overestimate implant revision risk.
Synovial Fluid and SynoviumComprehensive guide to synovium structure, synoviocyte types, synovial fluid composition, joint lubrication mechanisms, and clinical pathology for basic science viva preparation
Systemic Lupus Erythematosus - MusculoskeletalComprehensive orthopaedic guide to the musculoskeletal manifestations of SLE: Jaccoud arthropathy, multifocal avascular necrosis from corticosteroids, perioperative risk stratification, and antiphospholipid syndrome considerations for the surgeon.
Systemic Sclerosis / Scleroderma - MusculoskeletalFellowship-level guide to the musculoskeletal and hand manifestations of systemic sclerosis (scleroderma): sclerodactyly and flexion contractures, Raynaud's and digital ulcers, calcinosis, acro-osteolysis, tendon friction rubs, arthritis and erosive change - the autoantibody/subtype associations, and the cautious, mostly medical management with the pitfalls of operating on scleroderma skin.
Tendon HealingBiology of tendon healing including phases, intrinsic vs extrinsic mechanisms, collagen synthesis, growth factors, and factors affecting healing outcomes
Tendon Structure and CompositionComprehensive overview of tendon ultrastructure, molecular composition, hierarchical organization, and biomechanical properties essential for understanding tendon pathology and healing.
Tendon-Bone Interface (Enthesis)Anatomy, biomechanics, and healing of the specialized fibrocartilaginous insertion between tendon and bone
TeriparatideExam-focused guide to teriparatide in orthopaedics: what it is (recombinant PTH 1-34), the anabolic mechanism that builds bone, why intermittent dosing differs from continuous PTH excess, indications in severe osteoporosis, the evidence for fracture reduction, the role in fracture healing and atypical femoral fractures, the duration limit and osteosarcoma concern, and the must-do sequencing with anti-resorptives.
The Surgical Sieve (Clinical Reasoning Framework)Exam-focused guide to the surgical sieve and clinical reasoning: how to build a complete differential diagnosis with the VITAMIN CDEF / VINDICATE framework, dual-process thinking (fast pattern recognition versus slow analysis), the cognitive biases that cause diagnostic error, and how to use a structured sieve to score well in orthopaedic vivas and avoid missing diagnoses.
ThromboprophylaxisComprehensive guide to venous thromboembolism prevention in orthopaedic surgery including risk stratification, prophylaxis protocols, and evidence-based guidelines.
Titanium AlloysComprehensive guide to titanium alloys for FRCS examination
Tourniquet Use in Orthopaedic SurgeryExam-focused guide to the surgical pneumatic tourniquet: how it works, how to set safe cuff pressure (limb occlusion pressure), correct application and exsanguination, safe inflation time, the evidence in knee replacement, and the key complications (nerve injury, post-tourniquet syndrome, ischaemia-reperfusion) plus the contraindications you must know.
Tranexamic Acid UseComprehensive guide to tranexamic acid - mechanism, evidence, dosing protocols, safety, and clinical applications in arthroplasty, trauma, and spine surgery for orthopaedic exam
Transient Osteoporosis of the Hip / Regional Migratory OsteoporosisFellowship-level guide to transient osteoporosis of the hip (bone marrow oedema syndrome): a self-limiting, reversible cause of acute hip pain in middle-aged men and pregnant women, the diffuse femoral-head marrow oedema on MRI that distinguishes it from avascular necrosis, conservative management with protected weight-bearing, and the regional migratory variant.
Tribology and Wear in Orthopaedic ImplantsFundamental principles of friction, lubrication, and wear mechanisms in total joint arthroplasty including osteolysis and strategies for wear reduction
Type I and Type II ErrorsComprehensive guide to Type I (false positive) and Type II (false negative) errors, alpha and beta thresholds, and their clinical implications in research.
Vasculitides (Polyarteritis Nodosa / GPA) - Orthopaedic RelevanceFellowship-level guide to the systemic vasculitides relevant to orthopaedics - inflammatory disorders of blood vessels classified by vessel size (large: giant-cell/Takayasu; medium: polyarteritis nodosa; small/ANCA-associated: granulomatosis with polyangiitis [GPA], microscopic polyangiitis, EGPA) - covering their musculoskeletal manifestations (arthralgia/arthritis, myalgia), the limb-threatening consequences of ischaemia (digital/peripheral gangrene, mononeuritis multiplex), the danger of misdiagnosing a vasculitic limb as primary orthopaedic disease, and the principle that recognition leads to urgent immunosuppression rather than surgery alone.
ViscoelasticityComprehensive guide to viscoelastic behavior in orthopaedic biomaterials and tissues for FRCS exam preparation
Wear Mechanisms in Orthopaedic ImplantsComprehensive guide to wear types affecting orthopaedic bearing surfaces including adhesive, abrasive, fatigue, and third-body wear for FRCS exam preparation
Wound Closure TechniquesExam-focused guide to surgical wound closure: the layered approach, suture materials (absorbable vs non-absorbable, monofilament vs braided), the common suture techniques (simple interrupted, continuous, mattress, subcuticular), staples, tissue adhesives and adhesive strips, how to choose between them, and the principles of a tension-free, well-apposed, low-infection closure relevant to orthopaedic surgery.
Wound HealingExam-focused guide to soft-tissue and skin wound healing: the four overlapping phases (haemostasis, inflammation, proliferation, remodelling), the key cells and growth factors, healing by primary versus secondary intention, the factors that impair healing, and the practical and surgical relevance for orthopaedic wounds.
X-Linked Hypophosphataemic / Oncogenic (Tumour-Induced) OsteomalaciaFellowship-level guide to FGF23-mediated hypophosphataemic bone disease: X-linked hypophosphataemia (XLH, PHEX mutation) and tumour-induced (oncogenic) osteomalacia (TIO), the renal phosphate wasting with inappropriately low 1,25-vitamin D and NORMAL/high alkaline phosphatase, the biochemical and imaging workup (including localising FGF23-secreting tumours), and treatment with phosphate/active vitamin D, the anti-FGF23 antibody burosumab, and tumour resection for TIO.

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All Basic Science topics (160)

Other subspecialties