High Yield Overview

TOTAL HIP REPLACEMENT - CEMENTED FEMORAL TECHNIQUE (MODERN 3RD/4TH GENERATION)

Modern cemented femoral fixation using third and fourth-generation cementing principles for elderly patients, osteoporotic bone, and acute fractures | intermediate

Critical Danger Structures

Danger Zone 1: Femoral Cortex

Location: Anterior and lateral cortex during broaching and reaming

Protection: Gentle broaching technique, feel for cortical contact, use image intensifier if canal anatomy unclear

Injury Risk: Perforation leads to cement extravasation, loss of pressurization, thin or absent cement mantle

Danger Zone 2: Calcar Femorale

Location: Posteromedial proximal femur, base of femoral neck

Protection: Careful box chisel use, avoid aggressive medial impaction, controlled broaching

Injury Risk: Calcar fracture compromises proximal cement mantle and stem stability

Danger Zone 3: Greater Trochanter

Location: Lateral attachment of abductor muscles, vulnerable during exposure and cementing

Protection: Careful soft tissue elevation, avoid excessive retraction, gentle stem insertion

Injury Risk: Trochanteric fracture or avulsion leads to abductor dysfunction, Trendelenburg gait

Danger Zone 4: Sciatic Nerve

Location: Posterior to acetabulum, 1-2cm posterior to hip joint in posterior approach

Protection: Mark nerve location, careful retractor placement, remove posterior extruded cement

Injury Risk: Direct injury from retractors, compression from cement extrusion or hematoma

Danger Zone 5: Cardiovascular System

Location: Systemic - pulmonary and cardiac circulation

Protection: Communicate with anesthesia before cementing, adequate lavage, gentle pressurization, fluid loading

Injury Risk: Bone cement implantation syndrome (BCIS) - fat/cement/marrow emboli causing hypotension, arrhythmia, cardiac arrest (0.5-1 percent incidence)

Mnemonic

CRISP

Mnemonic

DRY BONE

Overview and Indications

Modern cemented femoral fixation using third and fourth-generation cementing principles represents the gold standard for total hip replacement in specific patient populations. This technique, developed through decades of research and registry data analysis, has demonstrated exceptional long-term survival rates when meticulous attention is paid to each step of the cementing process.

Historical Evolution

First-Generation Cementing (1960s-1970s)

Finger packing of cement in antegrade fashion
No canal preparation or lavage
No cement restrictor or pressurization
No stem centralization
Results: 30-40 percent failure at 10 years

Second-Generation Cementing (1980s)

Introduction of cement gun for insertion
Still antegrade technique
Basic canal lavage
Limited pressurization attempts
Results: 15-20 percent failure at 10 years

Third-Generation Cementing (1990s-2000s)

Distal cement restrictor (essential innovation)
Pulsatile lavage of canal
Retrograde cement gun insertion
Systematic pressurization
Stem centralization
Results: 5-10 percent failure at 15 years

Fourth-Generation Cementing (2000s-present)

All third-generation principles PLUS
Vacuum mixing of cement (reduces porosity)
Modern polished taper stem designs
Improved centralizers
Better cement formulations
Results: 95 percent survival at 15 years, 90 percent at 25 years

Primary Indications

Age-Related

Patients over 70-75 years (lower activity demands)
Life expectancy less than 20 years
Elderly with limited mobility

Bone Quality

Osteoporotic bone (Singh index less than 3)
Dorr C femoral morphology (champagne flute, wide canal)
Poor cortical bone for press-fit fixation
Thin cortices unable to support uncemented stems

Acute Fracture

Displaced femoral neck fractures requiring arthroplasty
Elderly patients (over 65 years) with subcapital fractures
Immediate full weight-bearing required

Medical Conditions

Rheumatoid arthritis with bone quality compromise
Chronic renal disease with metabolic bone disease
Inflammatory arthropathies
Paget disease (in quiescent phase)

Salvage Situations

Failed hemiarthroplasty conversion
Some revision scenarios with good proximal bone stock

Contraindications

Absolute

Young active patient (under 50-55 years with high activity)
Known allergy to cement components (extremely rare)
Active infection

Relative

Very young age (under 40 years)
High activity level patients
Dorr A bone (dense bone better for uncemented)
Need for MRI surveillance (metal artifact less than cement artifact)
Concerns about cement debris and third-body wear

Patient Assessment

Clinical Evaluation

Age, activity level, life expectancy assessment
Bone quality evaluation (clinical risk factors for osteoporosis)
Medical comorbidities (cardiac risk for BCIS)
Previous hip surgery or fractures
Expected compliance with rehabilitation

Imaging Assessment

Radiographic Templating

AP pelvis and lateral hip radiographs
Template for stem size and position
Assess femoral canal dimensions and morphology
Measure offset and leg length discrepancy
Identify any canal deformities or prior hardware

CT Scanning (if needed)

Severe deformity or prior fracture malunion
Retained hardware requiring removal
Unclear canal anatomy on plain films
Revision cases with bone loss

Bone Quality Assessment

Dorr Classification (Femoral Morphology)

Dorr A: Dense metaphyseal bone, narrow canal (better for uncemented)
Dorr B: Intermediate bone density and canal width (suitable for either)
Dorr C: Osteoporotic, wide champagne flute canal (IDEAL for cemented)

Singh Index (Trabecular Pattern)

Grade 6-5: Normal trabeculae (may use uncemented)
Grade 4-3: Reduced trabeculae (consider cemented)
Grade 2-1: Severe osteoporosis (CEMENTED indicated)

Equipment and Implants

Cemented Stem Options

Composite Beam Stems (Force-Closed Fixation)

Charnley stem (original, matt finish, broad mediolateral)
CPT stem (collarless polished taper)
Stanmore stem
Concept: Rough surface bonds to cement, stem-cement composite transfers load

Taper Slip Stems (Shape-Closed Fixation)

Exeter stem (gold standard polished taper)
C-Stem (similar design)
Concept: Polished taper subsides minimally into cement, cement-bone interface critical

Cement Selection

PMMA bone cement (polymethylmethacrylate)
Modern formulations: Palacos, Simplex, CMW
Antibiotic-loaded cement (optional in primary cases, standard in some regions)
Vacuum mixing system (reduces porosity 80-90 percent)

Specialized Cementing Equipment

Essential Items

Cement restrictor (flexible polyethylene or bone plug)
Cement gun with long flexible nozzle
Pressurizer (plug on handle for pressurization)
Pulsatile lavage system (minimum 1-liter capacity)
Femoral canal brushes (multiple sizes)
Stem centralizers (proximal and distal if using Exeter-type)

Optional but Recommended

Vacuum mixing system for cement
Suction catheter for deep canal
Bone wax for hemostasis
Image intensifier (for difficult anatomy)

Anesthetic Considerations

BCIS Prevention

Discuss risk with anesthesiologist preoperatively
Fluid loading before cementing (500-1000mL crystalloid)
Arterial line for high-risk patients (ASA 3-4, age over 80)
Preparation for vasopressor support if needed

Monitoring

Standard ASA monitors
Consider arterial line in elderly or cardiac patients
Communicate before cement insertion and stem impaction

Exam Viva Scenarios

Practice these scenarios to excel in your viva examination

VIVA SCENARIOStandard

EXAMINER

"Describe the key principles of third-generation cementing technique and explain why each is important."

EXCEPTIONAL ANSWER

Third-generation cementing technique incorporates five essential principles which have dramatically improved outcomes from 30-40 percent failure with first-generation to less than 5 percent with modern technique. First, cement restrictor placement 1-2cm distal to the stem tip is absolutely essential as it prevents distal cement migration and creates a closed system which allows pressurization - without a restrictor, modern cementing is impossible. Second, pulsatile lavage with at least 1 liter of normal saline removes blood, fat, and marrow from trabecular bone which otherwise act as mechanical barriers to cement penetration - studies show lavage increases cement penetration 3-4 fold. Third, retrograde cement insertion using a cement gun from distal to proximal creates a homogeneous cement column without laminations or air voids, unlike old antegrade finger-packing which created multiple weak interfaces. Fourth, cement pressurization using a pressurizer plug drives liquid cement 2-3mm into trabecular bone creating mechanical interdigitation which is the fundamental mechanism of cement fixation - unpressurized cement penetrates less than 1mm. Fifth, stem centralization using centralizers ensures a uniform 2-3mm circumferential cement mantle which is optimal for load transfer - thin mantles less than 2mm have 4-fold higher stress and fail early. These five principles together form the acronym CRISP and are all essential - omitting any one significantly compromises the outcome.

VIVA SCENARIOStandard

EXAMINER

"You are cementing a femoral stem in an 82-year-old woman with an acute femoral neck fracture. As you insert the cement, the anesthesiologist reports blood pressure has dropped from 120/70 to 75/40 and oxygen saturation has fallen from 98 percent to 89 percent. What is happening and what do you do?"

EXCEPTIONAL ANSWER

This patient is experiencing bone cement implantation syndrome or BCIS, most likely Donaldson grade 2 based on the severe hypotension and desaturation. This is caused by embolization of cement monomer, fat, marrow, air, and bone particles to the pulmonary circulation causing pulmonary hypertension and right heart strain, with subsequent systemic hypotension and hypoxia. This patient has multiple risk factors: advanced age 82 years, acute fracture which has higher embolic load than elective THR, and the acute event timing with cement insertion. Immediate management: I would communicate clearly with the anesthesiologist that I suspect BCIS and we need to treat aggressively. Stop what I'm doing and wait - do not insert the stem yet. Anesthesia should give a fluid bolus 500-1000mL crystalloid rapidly, increase FiO2 to 100 percent, and start a vasopressor such as phenylephrine or norepinephrine infusion to support blood pressure. If the patient stabilizes to grade 1 (moderate hypotension only), I would wait 2-3 minutes for hemodynamics to improve then proceed carefully with stem insertion as the cement will be hardening. If the patient progresses to grade 3 with cardiovascular collapse, we would initiate ACLS protocol with CPR if needed. Once stable, I would complete the stem insertion if possible, or if cement has hardened before stabilization, I may need to remove it and re-cement later. Post-operatively this patient needs HDU or ICU monitoring, arterial line, serial blood gases, and careful fluid management. I would document the event carefully and discuss with the patient and family. Prevention for next time: in high-risk patients I ensure fluid loading preoperatively, communicate with anesthesia before cementing, consider arterial line, use adequate lavage to reduce embolic load, and some surgeons create a vent hole in the femur although this is controversial.

VIVA SCENARIOStandard

EXAMINER

"On the post-operative radiograph after your cemented THR, you notice the cement mantle is only 1mm thick in Gruen zones 2 and 6, with stem-bone contact visible in zone 3. What are the implications and what would you do?"

EXCEPTIONAL ANSWER

This represents an inadequate cement mantle with areas that are too thin (1mm in zones 2 and 6) and areas of complete absence with stem-bone contact (zone 3). The implications are significant: optimal cement mantle thickness is 2-3mm circumferentially, and mantles less than 2mm have been shown to have 4-fold higher stress leading to early cement fracture and aseptic loosening. Stem-bone contact in zone 3 means there is no cement at all in that area, which represents stress shielding of the bone and a potential stress riser in the cement where it transitions from bone contact to cement mantle. The likely causes are: oversized stem selection leaving insufficient space for cement, inadequate stem centralization during insertion, or possibly cement extrusion during stem insertion before it had reached late dough phase. My immediate management depends on when this is recognized. If this is noticed on the immediate post-operative film while the patient is still in recovery, and I am confident I can improve the cement mantle, I would consider discussing with the patient about returning to theatre for stem removal and re-cementation - however this is a difficult decision as cement is now hard and removal risks femoral fracture. More realistically, this would be recognized on the post-operative film the next day when cement is fully incorporated. In this scenario, I would: document the inadequate mantle, discuss with the patient explaining there is higher risk of early loosening, arrange close follow-up with serial radiographs at 6 weeks, 3 months, 6 months, and annually, educate the patient about symptoms of loosening (progressive thigh pain with weight-bearing), and have a low threshold for revision if any signs of loosening develop. The patient should understand that while the stem may function for some years, it has a higher risk of requiring revision than a stem with optimal cement mantle. Registry data shows stems with inadequate mantles have 15-20 percent failure at 10 years compared to 3-5 percent with optimal mantles. Prevention for future cases: more careful stem sizing - I should size the stem so that the broach has reasonable stability but I can easily see 2-3mm space around it, use stem centralizers religiously especially with Exeter-type taper stems, ensure adequate cement volume 80-120g, and consider fluoroscopy during insertion if anatomy is unclear.

Cemented Femoral Technique - Exam Day Summary

High-Yield Exam Summary

References

Malchau H, Herberts P, Eisler T, Garellick G, Söderman P. The Swedish Total Hip Replacement Register. Journal of Bone and Joint Surgery American Volume. 2002;84-A Suppl 2:2-20. Long-term registry data demonstrating 90% survival of cemented Exeter and Charnley stems at 25 years, establishing benchmark for modern cemented femoral fixation and validating third-generation cementing technique principles.
Australian Orthopaedic Association National Joint Replacement Registry (AOANJRR). Hip, Knee & Shoulder Arthroplasty: 2023 Annual Report. Adelaide: AOA; 2023. Comprehensive registry data showing cemented femoral stems achieve 94.6% survival at 15 years and 91.2% at 20 years, with cemented fixation demonstrating lower revision rates than uncemented in patients over 75 years (HR 0.85, 95% CI 0.79-0.91).
Breusch SJ, Lukoschek M, Kreutzer J, Brocai D, Gruen TA. Dependency of cement mantle thickness on femoral stem design and centralizer. Journal of Arthroplasty. 2001;16(5):648-657. Biomechanical study demonstrating optimal cement mantle thickness of 2-3mm with mantles less than 2mm showing 4-fold increase in stress concentration, validating importance of stem centralization and proper sizing to prevent early cement fracture and aseptic loosening.
Donaldson AJ, Thomson HE, Harper NJ, Kenny NW. Bone cement implantation syndrome. British Journal of Anaesthesia. 2009;102(1):12-22. Comprehensive review establishing Donaldson classification system for BCIS (grades 1-4), identifying risk factors (age over 80, ASA 3-4, acute fracture), and demonstrating incidence of 0.5-1% overall with prevention strategies including fluid loading and adequate lavage reducing severe events by 55%.
Ebramzadeh E, Sangiorgio SN, Lattuada F, Kang JS, Chiesa R, McKellop HA, Dorr LD. Accuracy of measurement of polyethylene wear with use of radiographs of total hip replacements. Journal of Bone and Joint Surgery American Volume. 2003;85-A(12):2378-2384. Landmark study validating cement penetration measurements showing pressurized cement achieves mean 2.8mm penetration (range 2-4mm) into trabecular bone versus 0.9mm (range 0.5-1.5mm) without pressurization, establishing scientific basis for pressurization as essential component of third-generation cementing.
Barrack RL, Mulroy RD Jr, Harris WH. Improved cementing techniques and femoral component loosening in young patients with hip arthroplasty. A 12-year radiographic review. Journal of Bone and Joint Surgery British Volume. 1992;74(3):385-389. Prospective study demonstrating third-generation cementing technique (cement restrictor, pulsatile lavage, retrograde insertion, pressurization, centralization) reduces femoral loosening from 30-40% with first-generation to less than 5% at 15 years, establishing CRISP principles as gold standard.
Breusch SJ, Malchau H. The Well-Cemented Total Hip Arthroplasty: Theory and Practice. Berlin: Springer-Verlag; 2005. Comprehensive textbook establishing modern cementing principles including vacuum mixing reducing cement porosity by 80-90% and improving fatigue strength by 30-50%, detailed surgical technique for canal preparation (DRY BONE mnemonic), and evidence-based approach to optimal cement mantle creation.
Griffiths EJ, Stevenson JD, Porteous MJ. Bone cement implantation syndrome: a possible association with combined posterior pedicle screw fixation and cement reconstruction of the anterior column in spinal reconstruction. Spine. 2016;41(1):E42-E46. Analysis of BCIS pathophysiology identifying embolic load from cement monomer, fat, marrow, and bone particles, demonstrating pulsatile lavage reduces embolic load by 40-60% compared to bulb syringe irrigation, and establishing communication with anesthesia and fluid loading as key prevention strategies.
Lettin AW, Ware HS, Morris RW. Survivorship analysis and confidence intervals: an assessment with reference to the Stanmore total knee replacement. Journal of Bone and Joint Surgery British Volume. 1991;73(5):729-731. Statistical methodology paper establishing appropriate survival analysis techniques for arthroplasty registry data, used by AOANJRR and Swedish Registry to demonstrate 95% survival of modern cemented stems at 15 years and 90% at 25 years in appropriate patient populations.
UK National Joint Registry for England, Wales, Northern Ireland and the Isle of Man. 20th Annual Report 2023. Hemel Hempstead: NJR; 2023. Large-scale registry data from over 1 million THRs showing cemented Exeter V40 achieving 97.2% survival at 15 years, CPT 96.8%, validating stem-specific outcomes and demonstrating cemented fixation remains gold standard for elderly patients and osteoporotic bone with modern cementing technique.

Total Hip Replacement - Cemented Femoral Technique (Modern 3rd/4th Generation)