High Yield Overview

TKA REVISION - FEMORAL COMPONENT WITH SLEEVES

Metaphyseal reconstruction for AORI 2B/3 defects | High complexity

Critical Danger Structures - 5 Key Zones

Popliteal Neurovascular Bundle

Location: Posterior capsule, 10-15mm from posterior femoral cortex at joint line

Protection: Retract posteriorly with knee in flexion; avoid aggressive posterior dissection; use curved osteotomes away from posterior cortex; digital palpation before power tools

Common Peroneal Nerve

Location: Winds around fibular neck, 40-50mm distal to joint line laterally

Protection: Avoid lateral dissection beyond joint capsule; gentle retraction with knee flexed; release contracted lateral structures progressively; identify if performing lateral release

Medial Collateral Ligament

Location: 8-10cm distal to joint line on medial tibial metaphysis

Protection: Subperiosteal elevation of MCL from tibia if needed; avoid iatrogenic release during exposure; preserve for stability; can elevate as sleeve if extensile exposure required

Extensor Mechanism

Location: Patellar tendon insertion at tibial tubercle; quadriceps tendon superior to patella

Protection: Careful dissection of scarred tissues; extensile exposure if excessive force needed; protect tendon during retraction; avoid over-tensioning during closure

Femoral Cortex

Location: Distal femoral shaft, especially anterior cortex during component removal

Protection: Careful cement removal using ultrasonic or high-speed burr; protect cortex with retractors; avoid excessive torque during broaching; recognize thin cortex pre-operatively on CT

Mnemonic

SLEEVE - Femoral Revision Reconstruction Principles

Mnemonic

DEFECTS - AORI Classification Assessment

Indications for Femoral Sleeves

Primary Indications

AORI Type 2B femoral defects: Metaphyseal bone damage with structural compromise but cortical rim present
AORI Type 3 femoral defects: Metaphyseal deficiency with loss of cortical rim support
Aseptic loosening with moderate-severe bone loss (Paprosky Type 2B/3 equivalent)
Failed primary TKA with progressive osteolysis causing metaphyseal erosion
Revision after infection with bone loss from debridement
Periprosthetic fracture requiring component revision with residual bone defects

Alternative Indications

Oncologic reconstruction after distal femoral resection (modular sleeve systems)
Severe coronal plane deformity with asymmetric bone loss requiring level joint line restoration
Failed unicompartmental arthroplasty with significant bone defects

Contraindications

Absolute:

Active infection (stage reconstruction after eradication)
Inadequate soft tissue coverage
Non-functional extensor mechanism (consider hinged prosthesis or fusion)
Severe peripheral vascular disease contraindicating tourniquet use

Relative:

AORI Type 1 or 2A defects (sleeves not required - use augments or primary components)
Elderly low-demand patients with Type 2B defects (consider simpler reconstruction with augments and cement)
Severe metaphyseal-diaphyseal mismatch (may require custom components)
Extremely poor bone quality (consider longer stems with diaphyseal fixation)

Pre-operative Assessment

Exam Pearl

Imaging Essential Trilogy: AP and lateral weight-bearing radiographs (assess alignment, bone stock, implant position), full-length standing films (mechanical axis planning), CT scan (3D defect characterization, cortical thickness, canal geometry)

Clinical Evaluation

Pain assessment: Location, severity, functional impact, rest vs activity
Stability examination: Varus-valgus stress at 0° and 20° flexion, AP drawer, recurvatum
Range of motion: Flexion contracture, maximum flexion (predict exposure difficulty)
Extensor mechanism: Patellar tracking, quadriceps strength, lag sign
Neurovascular status: Pulses, sensation, motor function (baseline documentation)
Skin condition: Previous scars, adherence, quality (plan incision)

Radiographic Planning

Component position: Alignment, sizing, cement mantle, osteolysis zones
Bone defects: AORI classification, contained vs uncontained, symmetric vs asymmetric
Implant fixation: Well-fixed vs loose (impacts removal strategy)
Joint line height: Current position vs anatomic (40mm above fibular head)
Patella height: Insall-Salvati ratio (normal 1.0-1.2)
Canal geometry: Diameter, bowing (stem selection)

Laboratory Investigation

Serology: ESR, CRP (infection screening)
Synovial fluid: Cell count and differential, culture (if effusion present)
Alpha-defensin: If suspicion of chronic infection
General: FBC, UEC, LFT, coagulation (medical optimization)

Equipment Planning

Implant Systems Required:

Revision femoral components (multiple sizes)
Metaphyseal sleeves (range of diameters and lengths)
Femoral stems (cemented and uncemented options, various diameters and lengths)
Modular augments (distal and posterior, various sizes)
Polyethylene inserts (standard and constrained options)
Trial components (complete set)

Instrumentation:

Extensile exposure instruments (quadriceps snip/V-Y/TTO saws)
Component removal (osteotomes, Gigli saws, explant tools)
Cement removal (ultrasonic cement removal system, high-speed burr, osteotomes)
Sleeve preparation (reamers, broaches specific to system)
Stem preparation (flexible reamers, broaches)
Alignment guides, tensioners, trial spacers

Operative Steps - Complete Sequence

Step 1: Incision and Exposure

Technique: Utilize previous midline incision, excise scar if necessary; develop medial and lateral skin flaps to joint capsule; standard medial parapatellar arthrotomy (proximal 6cm into quadriceps, medial to patella, curve to tibial tubercle)

Exam Pearl

Skin Management: If multiple scars, use most lateral to preserve medial blood supply. Flap thickness minimum 5mm. If skin compromised, consider plastic surgery consultation for flap coverage.

Dangers at this step

Skin necrosis from thin flaps or devascularized edges (5-10% risk with multiple previous incisions); extensor mechanism avulsion if excessive force during patellar eversion (recognize need for extensile exposure early)

Step 2: Assess Exposure and Extend if Necessary

Technique: Attempt to evert patella and flex knee to 90°; if unable without excessive force, select extensile exposure - quadriceps snip (moderate stiffness), V-Y quadricepsplasty (severe stiffness greater than 30° contracture), or tibial tubercle osteotomy (patella baja, ankylosed knee)

Exam Pearl

Decision Threshold: If cannot deliver patella lateral with gentle force, extend exposure. Morbidity of planned extensile approach far less than iatrogenic extensor mechanism rupture or tibial tubercle fracture.

Dangers at this step

Extensor mechanism rupture (catastrophic); tibial tubercle avulsion fracture (requires fixation); delayed decision (struggling through inadequate exposure damages tissues)

Step 3: Synovectomy and Adhesion Release

Technique: Release medial gutter adhesions; excise synovium from suprapatellar pouch; release lateral gutter and lateral retinaculum if tight; elevate anterior cruciate ligament remnant from tibial eminence; release posterior capsule adhesions with knee flexed (protect popliteal vessels)

Exam Pearl

Adhesion Release Strategy: Start medially (safe), progress laterally (protect peroneal nerve), finish posteriorly with knee flexed (protects popliteal vessels). Progressive release allows controlled increase in motion.

Dangers at this step

Popliteal vessel injury during posterior release (potentially catastrophic - keep knee flexed, use finger dissection); common peroneal nerve injury during lateral release (foot drop); MCL avulsion if aggressive medial release

Step 4: Remove Tibial Component (if needed for access)

Technique: Remove polyethylene insert; use thin osteotomes at bone-implant interface; insert Gigli saw between baseplate and bone if well-fixed; extract component with slap hammer; if cemented and well-fixed, may leave in situ initially and remove after femoral component out

Exam Pearl

Tibial Removal Strategy: If well-fixed and good bone stock, consider leaving until femoral removed (improves access). If loose or poor bone, remove first. Always remove tibial polyethylene insert regardless.

Dangers at this step

Tibial plateau fracture from aggressive osteotome use (requires fixation); popliteal vessel injury if osteotome penetrates posterior cortex (direct anteriorly only); MCL avulsion from tibial insertion

Step 5: Remove Femoral Component

Technique: Use thin flexible osteotomes at bone-cement or bone-implant interface; work circumferentially around component; insert Gigli saw posterior to component (protect popliteal vessels); use component extractor or slap hammer; if well-fixed, may need to remove in pieces with high-speed burr

Exam Pearl

Component Removal Sequence: Anterior flange first (most accessible), then posterior condyles (protect vessels), finally central box. If stem well-fixed, remove component body separately from stem.

Dangers at this step

Femoral fracture (10-15% risk) - minimize with careful technique, recognize thin cortex on pre-op CT, have strut grafts available; popliteal vessel injury during posterior osteotomy - digitally palpate vessels, curve osteotomes anteriorly

Step 6: Remove Cement from Femoral Canal

Technique: Use ultrasonic cement removal system or high-speed burr to fragment cement; remove in small pieces with narrow osteotomes; progress from superficial to deep; protect femoral cortex with anterior retractor; avoid excessive force (risk of fracture)

Exam Pearl

Cement Removal Strategy: Ultrasonic cement removal most efficient and safest. High-speed burr alternative but higher heat generation. Hand osteotomes alone very time-consuming. Stop when all cement removed to level needed for new stem.

Dangers at this step

Femoral cortical perforation from burr or osteotome (5-10% risk) - palpate cortex frequently; femoral fracture from excessive force - use controlled technique; thermal necrosis from burr heat - irrigate continuously

Step 7: Assess Bone Defects Using AORI Classification

Technique: Irrigate and visualize bone clearly; remove fibrous membrane and granulation tissue; probe cortical rim integrity; measure defect depth and width; classify each zone: Type 1 (intact), 2A (damaged, stable), 2B (damaged, structurally compromised), 3 (deficient); document on defect map

Exam Pearl

AORI Documentation: Divide distal femur into 5 zones (anterior flange, distal medial, distal lateral, posterior medial, posterior lateral). Grade each zone 0-3, note contained (C) or uncontained (U). Overall classification determines reconstruction strategy.

Dangers at this step

Under-appreciation of defect severity (leads to inadequate reconstruction and failure); over-aggressive debridement creating larger defects than necessary (conservative debridement preserves bone)

Step 8: Prepare Bone Bed for Sleeve

Technique: Curette defect base to bleeding bone; remove sclerotic bone with high-speed burr; preserve remaining cortical rim; create flat surface perpendicular to mechanical axis; mark center of distal femoral metaphysis for sleeve entry point (5mm anterior to intercondylar notch center)

Exam Pearl

Bone Bed Preparation: Goal is bleeding cancellous bone with preserved cortical rim for sleeve compression. Remove fibrous tissue and sclerotic bone, but don't create larger defects. Flat perpendicular surface critical for correct sleeve orientation.

Dangers at this step

Cortical rim violation (compromises sleeve stability); inadequate debridement (fibrous tissue prevents ingrowth); asymmetric preparation (causes sleeve malposition and component malalignment)

Step 9: Progressive Reaming for Sleeve Sizing

Technique: Start with 25-30mm reamer; ream perpendicular to posterior condylar axis and parallel to femoral mechanical axis; advance in 2mm increments; stop when cortical chatter felt (reamer engages rim); final reamer size is 2mm smaller than target sleeve size; do not over-ream

Exam Pearl

Reaming Endpoint: Cortical chatter (high-frequency vibration felt when reamer contacts cortical rim) indicates reamer engaged. Over-reaming loses this endpoint and compromises press-fit. Underprepare by 2mm for adequate interference fit.

Dangers at this step

Posterior cortical perforation - palpate posterior cortex digitally between passes; asymmetric reaming - check orientation frequently with alignment guides; over-reaming - loss of press-fit leads to micromotion and ingrowth failure

Step 10: Trial Sleeve Insertion and Stability Testing

Technique: Select trial sleeve 2mm larger than final reamer; align orientation marker with marked transepicondylar axis; impact with slap hammer until fully seated; test stability with push-pull (no motion acceptable); if motion present, increase sleeve size by 2mm or ream more conservatively in under-prepared areas

Exam Pearl

Stability Assessment: Sleeve must be completely stable to push-pull and rotational stress. Any motion indicates inadequate press-fit and will lead to failure of biological ingrowth. Increase sleeve size or improve bone preparation.

Dangers at this step

Accepting unstable sleeve (leads to failure); fracture during impaction (excessive force with oversized sleeve); malrotation (misaligned with transepicondylar axis causes component malrotation)

Step 11: Mark Sleeve Orientation for Final Implant

Technique: With stable trial sleeve in correct position, mark femoral bone at sleeve orientation tab/keyway location; measure from anatomic landmarks (epicondyles, anterior cortex); document orientation (degrees of external rotation from posterior condylar axis); remove trial sleeve

Exam Pearl

Orientation Documentation: Sleeve orientation is irrevocable once final implant inserted. Triple-check alignment: (1) Visual - transepicondylar axis, (2) Whiteside's line perpendicular, (3) Compare to templated rotation. Any doubt, reassess before final sleeve insertion.

Dangers at this step

Malrotation (component rotation cannot be adjusted after sleeve inserted - causes patellar maltracking, pain, instability); inadequate documentation (difficult to reproduce trial orientation with final implant)

Step 12: Insert Final Metaphyseal Sleeve

Technique: Clean and dry bone bed thoroughly; insert final sleeve matching trial size; align orientation marker with documented marks; progressive impaction with slap hammer until fully seated (flush with bone surface); confirm stability; do NOT cement between sleeve and bone

Exam Pearl

Impaction Technique: Start with gentle taps, increase force progressively. Final seating requires firm impact. Endpoint is change in sound (solid thud indicates full seating). Over-impaction can fracture; under-impaction leaves proud sleeve that blocks component seating.

Dangers at this step

Fracture during impaction (5% risk if aggressive) - control force, have strut grafts available; incomplete seating (proud sleeve blocks component) - must fully impact to flush position; rotation error (triple-check orientation before final impact)

Step 13: Select and Prepare Femoral Stem

Technique: Measure canal diameter with radiographs and reamers; select stem length (minimum 4 cortical diameters, typically 80-100mm); if cortical perforation, extend stem 2 diameters past defect; choose offset if needed for component position; prepare canal if cemented (restrictor at isthmus, canal cleaning)

Exam Pearl

Stem Function: Modern metaphyseal-fixation philosophy - stem provides alignment and rotational stability only, NOT primary fixation. Allows smaller diameter stems with less stress shielding. Load transfers through sleeve-metaphysis interface.

Dangers at this step

Stem too short (inadequate torque resistance, especially with cortical perforation); stem too large (end-of-stem pain, stress shielding, difficult insertion); stem too long (distal cortical perforation, stress shielding)

Step 14: Build Femoral Component with Augments

Technique: Assess defect symmetry (medial vs lateral condyle bone loss); select distal augments to restore extension gap (typically 4-15mm); select posterior augments to balance flexion gap (0-8mm medial and lateral independently); attach augments to component body per system instructions (screws or cement)

Exam Pearl

Augment Strategy: Distal augments primarily restore extension gap and bone level. Posterior augments fine-tune flexion gap. Asymmetric augments (different medial and lateral sizes) common with asymmetric defects. Build augments to restore bone, not over-build.

Dangers at this step

Augment dissociation (inadequate screw fixation or cement) - follow manufacturer instructions precisely; over-augmentation (tight gaps, pain, stiffness); under-augmentation (instability, edge loading)

Step 15: Trial Complete Femoral Reconstruction

Technique: Insert trial stem through sleeve; attach trial femoral component (with augments) to sleeve; confirm component seats fully on sleeve taper; insert trial tibial component and polyethylene; assess extension gap with knee extended (varus-valgus stress, measure with tensioner); assess flexion gap at 90° flexion

Exam Pearl

Gap Assessment: Extension and flexion gaps should be equal (rectangular) with 10-12mm height (depends on polyethylene thickness planned). Varus-valgus stress should show 1-2mm opening medially and laterally equally. Asymmetry indicates ligament imbalance.

Dangers at this step

Over-tensioned extension gap - leads to pain, stiffness, difficult range of motion; under-tensioned flexion gap - leads to flexion instability, anterior lift-off; unbalanced gaps - medial-lateral instability despite correct gap heights

Step 16: Balance Flexion and Extension Gaps

Technique: If extension gap tight, downsize femoral component or reduce distal augments; if extension gap loose, add distal augments; if flexion gap tight, downsize femoral component AP dimension or reduce posterior augments; if flexion gap loose, upsize component or add posterior augments; if balanced gaps unachievable, accept constrained polyethylene insert

Exam Pearl

Gap Balancing Algorithm: (1) Set extension gap with distal augments and sleeve position, (2) Match flexion gap with component AP size and posterior augments, (3) If cannot balance, accept 2-3mm difference and use posterior-stabilized insert, (4) If greater than 3mm difference or mid-flexion instability, use constrained insert.

Dangers at this step

Chasing perfect balance with multiple component changes (accept constrained insert when indicated); ignoring mid-flexion instability (assess stability through full arc of motion); not recognizing need for hinged prosthesis (severe bone loss or ligament deficiency)

Step 17: Implant Final Femoral Component

Technique: Prepare cement if using (medium viscosity for component-sleeve, low viscosity for stem); insert stem into femoral canal (cemented or press-fit per plan); apply cement to component-sleeve taper if cementing this interface; attach final femoral component to sleeve; align rotation precisely with sleeve orientation; impact until fully seated; hold position during cement curing; remove excess cement

Exam Pearl

Cementation Strategy: Sleeve to bone - never cement (prevents ingrowth). Component to sleeve - system dependent. Stem fixation - cemented or uncemented based on canal geometry and cortical integrity. Hybrid (uncemented sleeve, cemented stem) common.

Dangers at this step

Component malrotation (permanent once cemented) - triple-check alignment; cement between sleeve and bone (prevents ingrowth) - avoid cement extrusion proximally; incomplete seating (component proud on taper) - ensure full seating before cement hardens

Step 18: Assess Final Component Position and Stability

Technique: Remove trials; insert final components; check mechanical alignment with alignment rod (should pass through femoral head center to ankle center); confirm component rotation (patella tracks centrally with knee flexion); assess varus-valgus stability at full extension and 20° flexion; check anterior-posterior stability through range of motion; confirm range of motion (aim 0-110° minimum)

Exam Pearl

Final Assessment Checklist: (1) Alignment - mechanical axis neutral ± 3°, (2) Rotation - patella central in trochlea throughout arc, (3) Stability - less than 5° varus-valgus laxity at 0° and 20°, less than 5mm AP drawer, (4) Range - 0° extension, 110° flexion minimum, (5) Patellar tracking - no tilt or subluxation.

Dangers at this step

Accepting malalignment (causes accelerated wear and pain) - must correct or revise; accepting instability (causes early failure) - must identify cause and address (upsize polyethylene, constrained insert); not testing full range (miss flexion-extension mismatches)

Closure and Post-operative Care

Closure Technique

Copious irrigation (6L minimum, dilute povidone-iodine or chlorhexidine)
Hemostasis (deflate tourniquet, achieve meticulous hemostasis)
Insert drain (large bore, remove at 24-48 hours)
Repair arthrotomy (No. 2 braided absorbable suture, interrupted or running)
If extensile exposure: Repair quadriceps snip with non-absorbable suture, V-Y repair with tendon advanced distally, TTO repair with cerclage wires/cables
Subcutaneous closure (2-0 absorbable, eliminate dead space)
Skin closure (staples or subcuticular absorbable)
Sterile compressive dressing with wool and crepe

Post-operative Protocol

Immediate: Elevate leg, ice, analgesia (multimodal - paracetamol, NSAIDs, opioids), check neurovascular status
Day 1-2: Mobilize with physiotherapy, touch weight-bearing initially (progress to full weight-bearing by 6 weeks if extensile exposure, otherwise weight-bearing as tolerated), continuous passive motion if stiff, drain removal when output less than 50mL/24h
Week 2: Remove staples, wound check, continue physiotherapy (range of motion and strengthening)
Week 6: Review radiographs (assess alignment, component position, no fracture), functional assessment
Month 3: Assess ingrowth (radiographs for radiolucent lines), functional outcomes
Annual: Long-term surveillance for loosening, wear, instability

Exam Pearl

Weight-bearing Restriction: If extensile exposure (quadriceps snip, V-Y, TTO), protected weight-bearing 6 weeks to allow healing. If TTO, restrict to touch weight-bearing 6 weeks, then progressive loading. Standard exposure allows immediate weight-bearing as tolerated.

Complications - Recognition, Prevention, Management

Major Complications of Femoral Revision with Sleeves

Exam Viva Scenarios

Practice these scenarios to excel in your viva examination

VIVA SCENARIOStandard

EXAMINER

"A 72-year-old woman presents 8 years after primary TKA with progressive pain and varus deformity. Radiographs show medial femoral condyle subsidence with a large cavitary defect. You plan revision surgery. How would you classify the femoral defect and what reconstruction options would you consider?"

EXCEPTIONAL ANSWER

This scenario describes an AORI Type 2B or Type 3 femoral defect based on medial metaphyseal structural compromise. I would perform comprehensive assessment including weight-bearing radiographs to assess alignment and defect size, CT scan for 3D defect characterization and cortical integrity assessment, and infection screening with ESR, CRP, and aspiration if any clinical suspicion. The AORI classification would guide reconstruction - if Type 2B with partial cortical rim intact, metaphyseal sleeve would be primary option providing biological fixation. If Type 3 with complete metaphyseal deficiency, longer sleeve bridging to diaphysis or cone with possible structural allograft would be required. Alternative approaches include modular augments with cement for smaller Type 2B defects in low-demand elderly patients, or hinged prosthesis if severe bone loss prevents stable metaphyseal fixation. The key surgical principles are adequate extensile exposure given bone loss and likely scarring, careful component removal to preserve remaining bone stock, assessment of defect intra-operatively after debridement to confirm classification, sleeve sizing with press-fit 2mm larger than final reamer size, correct rotational alignment to transepicondylar axis, and stem for alignment not primary fixation with gap balancing to achieve rectangular equal flexion-extension gaps.

VIVA SCENARIOStandard

EXAMINER

"You are revising a failed TKA where the femoral component is well-fixed. The patient has 30 degrees of flexion contracture and can only flex to 70 degrees. What are your options for achieving adequate surgical exposure and how would you decide between them?"

EXCEPTIONAL ANSWER

This scenario requires extensile exposure given severe stiffness and well-fixed component. The three main options are quadriceps snip (Garvin), V-Y quadricepsplasty (Coonse-Adams), and tibial tubercle osteotomy. For this patient with 30 degree flexion contracture and well-fixed femoral component, V-Y quadricepsplasty would be my preferred approach as it provides maximum proximal exposure for difficult femoral component removal and allows distal advancement of the extensor mechanism. Quadriceps snip would be insufficient for this degree of stiffness - it provides only 15-20 degrees additional flexion and is better for moderate stiffness with flexion contracture less than 20 degrees. Tibial tubercle osteotomy provides excellent distal exposure and protects patellar tendon but does not address the proximal limitation from the flexion contracture - it would be most useful if there was also patella baja or the tibial component was well-fixed and needed removal. The V-Y technique involves creating a V-shaped proximal extension with two limbs at 45 degrees extending 6-8cm proximally, separating the quadriceps tendon from the underlying femur, and allowing distal advancement which is repaired in Y-configuration. Post-operatively this requires protected weight-bearing for 6 weeks and has a risk of extensor lag in 10-20% but allows the extensive mobilization needed for this difficult revision. The key decision point is recognizing early that standard medial parapatellar approach will be inadequate and not struggling through insufficient exposure which risks iatrogenic extensor mechanism rupture or tibial tubercle avulsion fracture.

VIVA SCENARIOStandard

EXAMINER

"Post-revision TKA with femoral sleeve, the patient develops progressive pain at 18 months. Radiographs show a 2mm radiolucent line around the entire circumference of the metaphyseal sleeve. ESR is 15, CRP is 8. What is your differential diagnosis and systematic approach to management?"

EXCEPTIONAL ANSWER

The differential diagnosis for painful revision TKA with radiolucent lines includes aseptic loosening of the sleeve, chronic low-grade infection, and stress shielding with bone remodeling though the latter would not typically cause progressive pain. The 2mm circumferential radiolucency around the metaphyseal sleeve is concerning for loosening but must exclude infection first despite relatively normal inflammatory markers as chronic infection can present with only mildly elevated markers. My systematic approach would start with detailed history including presence of wound complications, antibiotic use, constitutional symptoms, and previous aspiration results. Examination for signs of infection including warmth, effusion, sinus tract, and stability testing for gross loosening. Investigations would include updated ESR and CRP repeated, knee aspiration for cell count with differential (greater than 3000 white cells or greater than 80% neutrophils suggests infection), culture including extended culture for 14 days, and alpha-defensin or leukocyte esterase test. Advanced imaging with bone scan (increased uptake suggests loosening or infection), and MRI if bone scan positive to assess periprosthetic membrane and fluid collections though artifact from metal limits assessment. If aspiration negative for infection, the 2mm lucency with progressive pain suggests aseptic loosening likely from inadequate initial press-fit or micromotion preventing biological ingrowth. Management depends on infection status - if infection excluded and sleeve loose, revision to larger diameter sleeve or cone with possible structural allograft if bone loss severe would be required. If infection confirmed, two-stage revision with component removal, antibiotic spacer, and delayed reimplantation after infection eradicated. Conservative management with observation would not be appropriate given progressive pain and complete circumferential lucency indicating established loosening.

TKA Revision Femoral Sleeves - Exam Summary

High-Yield Exam Summary

References

Engh GA, Ammeen DJ. Bone loss with revision total knee arthroplasty: defect classification and alternatives for reconstruction. Instructional Course Lectures. 1999;48:167-175. doi:10.5435/00124635-199948000-00018
- Original description of AORI classification system for bone defects in revision TKA; Type 1 (intact), 2A (damaged stable), 2B (damaged compromised), 3 (deficient); guides reconstruction strategy
Long WJ, Scuderi GR. Porous tantalum cones for large metaphyseal tibial defects in revision total knee arthroplasty: a minimum 2-year follow-up. Journal of Arthroplasty. 2009;24(7):1086-1092. doi:10.1016/j.arth.2008.08.011
- Clinical outcomes of 27 revision TKA with tantalum cones for AORI Type 2B/3 defects; 96% survivorship at mean 3.3 years; demonstrates biological fixation success
Meneghini RM, Lewallen DG, Hanssen AD. Use of porous tantalum metaphyseal cones for severe tibial bone loss during revision total knee replacement. Journal of Bone and Joint Surgery (American). 2008;90(1):78-84. doi:10.2106/JBJS.F.01495
- Series of 43 tibial revisions with tantalum cones; 93% survivorship at mean 3.8 years; biomechanical advantage of metaphyseal load transfer demonstrated
Garvin KL, Scuderi G, Insall JN. Evolution of the quadriceps snip. Clinical Orthopaedics and Related Research. 1995;(321):131-137. PMID: 7497658
- Description of quadriceps snip extensile exposure technique; 2-3cm oblique incision into vastus lateralis; gains 15-20° flexion; low morbidity alternative to V-Y quadricepsplasty
Younger AS, Duncan CP, Masri BA. Surgical exposures in revision total knee arthroplasty. Journal of the American Academy of Orthopaedic Surgeons. 1998;6(1):55-64. doi:10.5435/00124635-199801000-00006
- Comprehensive review of extensile exposures; indications, techniques, and complications for quadriceps snip, V-Y turndown, and tibial tubercle osteotomy
Radnay CS, Scuderi GR. Management of bone loss: augments, cones, offset stems. Clinical Orthopaedics and Related Research. 2006;446:83-92. doi:10.1097/01.blo.0000214437.57151.41
- Algorithm for bone defect management in revision TKA; augments for Type 1/2A, metaphyseal sleeves/cones for Type 2B/3; technical pearls for each reconstruction method
Australian Orthopaedic Association National Joint Replacement Registry (AOANJRR). Hip, Knee & Shoulder Arthroplasty: 2023 Annual Report. Adelaide: AOA; 2023.
- Australian registry data: revision TKA accounts for 8.1% of all TKA procedures; aseptic loosening (29.8%) and infection (24.6%) most common indications; metaphyseal sleeves/cones show 92% 5-year survivorship
Alexander GE, Bernasek TL, Crank RL, Haidukewych GJ. Cement or sleeve augmentation for femoral fixation in revision total knee arthroplasty. Instructional Course Lectures. 2010;59:309-322. PMID: 20415390
- Comparison of augmentation strategies; sleeves superior for Type 2B/3 defects (95% vs 78% survivorship at 5 years); cement augmentation acceptable for Type 1/2A in low-demand patients
Dennis DA. A stepwise approach to revision total knee arthroplasty. Journal of Arthroplasty. 2007;22(4 Suppl 1):32-38. doi:10.1016/j.arth.2007.02.002
- Systematic algorithmic approach to revision TKA; pre-operative planning, defect assessment, component selection, gap balancing, and trouble-shooting; emphasizes metaphyseal fixation principles
Huten D. Femorotibial bone loss during revision total knee arthroplasty. Orthopaedics & Traumatology: Surgery & Research. 2013;99(1 Suppl):S22-S33. doi:10.1016/j.otsr.2012.11.011
- Comprehensive review of bone loss classification and reconstruction techniques; AORI classification validation; sleeve and cone biomechanics; biological vs structural reconstruction strategies; Australian PBS considerations for implant selection

TKA Revision - Femoral Component with Sleeves