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Revision TKA - Tibial Component Revision

Comprehensive surgical technique guide for tibial component revision in TKA including AORI classification, bone loss management, stems, sleeves, cones, and augments - FRCS exam preparation

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By OrthoVellum Medical Education Team

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High Yield Overview

REVISION TKA - TIBIAL COMPONENT

Midline approach with extensile options | Advanced complexity

Mnemonic

AORI

Mnemonic

STEM

Critical Danger Structures

Popliteal Artery

5-10mm posterior to posterior tibial cortex - At maximum risk during posterior retraction, tibial component extraction, and cement removal. Risk increases with fixed flexion deformity and posterior osteophytes. EXAM KEY: Maintain knee in flexion, careful posterior retractor placement, never place instruments posteriorly blindly

Common Peroneal Nerve

Wraps around fibular neck 2-4cm below joint line - At risk during lateral release, lateral retraction, and valgus correction. Injury causes foot drop. EXAM KEY: Limit lateral retraction, identify nerve if extensive lateral release needed, avoid valgus overcorrection

Patellar Tendon

Inserts on tibial tubercle - At risk during exposure, component removal, and eversion. Scarred in revision setting. Avulsion catastrophic. EXAM KEY: Consider TTO if patellar eversion difficult, protect during entire procedure, never force eversion

Tibial Cortex

Thin cortices in revision, stress risers from previous surgery - Perforation risk during cement removal, reaming, and stem insertion. Posterior cortex most vulnerable. EXAM KEY: Use fluoroscopy, ball-tip guidewire, avoid eccentric reaming

MCL/Medial Structures

MCL inserts 5-6cm below joint line on proximal tibia - At risk during medial release, component extraction, and stem insertion. Incompetence leads to instability. EXAM KEY: Protect during extraction, assess at trial, may need higher constraint if damaged

Indications for Tibial Revision

Primary Indications

  • Aseptic loosening - Progressive radiolucent lines, subsidence, pain
  • Polyethylene wear - Isolated liner exchange if tray stable and well-positioned
  • Infection - Stage 2 of two-stage revision for PJI
  • Instability - Tibial component malposition contributing to instability
  • Osteolysis - Progressive tibial bone loss

Secondary Indications

  • Malalignment - Varus/valgus tibial component malposition
  • Periprosthetic fracture - Fracture through tibial tray
  • Component failure - Baseplate fracture, locking mechanism failure
  • Isolated tibial issue - With well-fixed, well-positioned femoral component

Exam Pearl

AOANJRR Data: Most common reasons for TKA revision: loosening (30%), infection (25%), instability (15%), pain (10%). Tibial component loosening more common than femoral. Re-revision rate 15-20% at 10 years.

Contraindications

  • Active infection - Must complete two-stage protocol
  • Severe vascular disease - Risk of limb loss
  • Non-functioning extensor mechanism - Consider arthrodesis
  • Inadequate soft tissue coverage - May need flap

Pre-operative Planning

Essential Imaging

  1. Weight-bearing AP and lateral - Component position, loosening signs
  2. Long-leg alignment films - Mechanical axis, joint line position
  3. Skyline patella view - Patellar tracking, component position
  4. CT scan - Quantify bone loss, assess for osteolysis

Templating

  • Classify bone loss using AORI system
  • Plan stem length - bypass defects by 2 cortical diameters
  • Assess joint line position - restore to 10-15mm below inferior patella pole
  • Plan augment/sleeve/cone sizes
  • Determine constraint level needed

Infection Work-up

  • ESR, CRP - Elevated in 80-90% of PJI
  • Knee aspiration - Synovial WCC greater than 3000, PMN greater than 80%
  • Alpha-defensin - High sensitivity and specificity
  • Rule out infection before any aseptic revision

Special Considerations

  • Previous incisions - Use most lateral if multiple parallel
  • Soft tissue quality - Consider plastic surgery input if poor
  • Extensor mechanism - Plan TTO if eversion expected to be difficult

Exam Pearl

Joint Line Rule: The joint line should be 10-15mm below the inferior pole of the patella, or approximately 25mm below the medial epicondyle. Elevation leads to mid-flexion instability, lowering leads to extensor mechanism problems.

Exposure and Approach

Incision Planning

  • Use most lateral previous incision - Better blood supply from medial
  • Minimum 7cm between parallel incisions - Avoid skin bridge necrosis
  • Consider plastic surgery consult - If soft tissue compromised

Standard Approach

  1. Midline skin incision - Through or lateral to previous scar
  2. Medial parapatellar arthrotomy - Most common, familiar anatomy
  3. Release adhesions - Medial and lateral gutters, suprapatellar pouch
  4. Patellar eversion or lateral subluxation - Assess difficulty before forcing

Extensile Options

Quadriceps Snip:

  • 45-degree proximal extension into quadriceps tendon
  • Easy closure, minimal morbidity
  • First-line extensile approach

Tibial Tubercle Osteotomy (TTO):

  • Indications: Unable to evert patella, prior extensor mechanism surgery, multiply revised knee
  • Osteotomy length: 8-10cm
  • Width: 1-2cm
  • Hinge on lateral soft tissue
  • Closure: Cerclage wires or screws

Rectus Snip:

  • Inverted V in quadriceps tendon
  • Good exposure but more difficult closure
  • Consider if TTO contraindicated

Exposure Critical Points

  • Never force patellar eversion - patellar tendon avulsion catastrophic
  • Use extensile exposure early rather than struggling
  • TTO healing rate greater than 95% with proper technique
  • Protect patellar tendon throughout entire procedure

Component Removal

Polyethylene Insert Removal

  1. Identify locking mechanism - Peripheral or anterior
  2. Use appropriate removal tool - Match to implant system
  3. Avoid damaging tibial tray - If liner exchange planned

Tibial Baseplate Removal

Loose Component:

  1. Remove polyethylene insert
  2. Thin osteotomes around baseplate periphery
  3. Extract baseplate - may lift off easily

Well-Fixed Component:

  1. Remove polyethylene insert first
  2. Identify cement-implant vs cement-bone interface
  3. Thin osteotomes at chosen interface
  4. Gigli saw helpful for cutting cement mantle
  5. Extract baseplate - use extraction device if needed

Stem Removal

  1. Cemented stem - Osteotomes at cement-bone interface, cement removal tools
  2. Press-fit stem - Extraction devices, may need distal window if well-fixed
  3. Protect posterior structures - Never insert instruments blindly posteriorly

Cement Removal

  • Hand curettes - For accessible cement
  • Ultrasonic cement removal - Preserves bone stock
  • High-speed burr - For difficult areas
  • Fluoroscopy essential - Ensure complete removal, prevent perforation

Exam Pearl

Cement Removal Pearl: Removing cement from the posterior tibia is high risk for popliteal vessel injury. Use fluoroscopy, work under direct vision, and never insert long instruments blindly posteriorly.

Bone Loss Assessment and Management

Intraoperative Assessment

  1. Remove all components and cement
  2. Assess cortical rim - Intact vs compromised
  3. Classify using AORI - Type 1, 2A, 2B, or 3
  4. Assess ligamentous stability - MCL, LCL, PCL (if not PS)

Type 1 Management

  • Bone stock adequate - Cortical rim intact
  • Technique: Minimal resection to healthy bone
  • Augmentation: Cement fill for defects less than 5mm
  • Stem: May not need stem if stable
  • Constraint: Usually PS sufficient

Type 2A Management

  • Unilateral condylar loss - Usually medial from varus wear
  • Technique: Resect to healthy bone on intact side
  • Augmentation: Metal block(s) on deficient side
  • Stem: Required for stability (75-100mm typical)
  • Constraint: PS or VVC depending on soft tissue

Type 2B Management

  • Bilateral metaphyseal loss - Compromised cortical rim
  • Technique: Prepare metaphysis for sleeve or cone
  • Augmentation: Tibial sleeve or metaphyseal cone
  • Stem: Required, diaphyseal engagement
  • Constraint: VVC often needed due to associated soft tissue laxity

Type 3 Management

  • Massive bone loss - No metaphyseal support
  • Options:
    • Proximal tibial replacement (megaprosthesis)
    • Allograft-prosthesis composite
    • Impaction grafting (rarely used in tibia)
  • Stem: Long diaphyseal engagement essential
  • Constraint: Rotating hinge usually required

Exam Pearl

Sleeve vs Cone: Sleeves provide circumferential metaphyseal fixation and come in fixed sizes requiring bone preparation. Cones are impacted into contained defects and don't require as much bone removal. Sleeves restore joint line more predictably.

Tibial Component Implantation

Joint Line Restoration

  • Reference: 10-15mm below inferior patella, 25mm below medial epicondyle
  • Significance: Elevated joint line causes mid-flexion instability
  • Technique: Use augments/sleeves to restore appropriate level

Trial Reduction

  1. Insert trial tibial tray with stem
  2. Check rotation - Match to femoral component, tibial tubercle
  3. Check coverage - Maximize tibial coverage without overhang
  4. Check stability - Full ROM, varus/valgus stress, drawer tests
  5. Check tracking - Patellar tracking with thickest poly anticipated

Stem Selection

  • Length: Bypass all defects by 2 cortical diameters
  • Diameter: Largest that fits diaphysis comfortably
  • Offset: Use if needed to improve alignment without affecting canal
  • Fixation: Press-fit preferred (most cases) or cemented (poor bone)

Final Implantation

Cementless/Hybrid (Most Common):

  1. Sleeve/cone impacted to final position
  2. Press-fit stem inserted
  3. Baseplate seated on sleeve
  4. Cement under tray for surface fixation

Cemented:

  1. Cement in metaphysis and around stem
  2. Insert stem and tray as unit
  3. Pressurize cement
  4. Remove excess cement meticulously

Constraint Selection

  • PS (Posterior-Stabilized): Intact collaterals, minimal bone loss
  • VVC (Varus-Valgus Constrained): Moderate collateral laxity, Type 2 bone loss
  • Rotating Hinge: Severe instability, collateral deficiency, Type 3 bone loss

TTO Closure

When TTO Performed

Closure Technique:

  1. Position - Reduce TTO fragment anatomically
  2. Compression - Achieve fragment apposition
  3. Fixation options:
    • Cerclage wires (most common) - 2-3 wires
    • Screws (2-3 cortical screws proximal to distal)
    • Combination wire and screw

Post-operative Protocol:

  • Weight-bearing: WBAT with extension brace
  • ROM: Limit flexion to 90° for 6 weeks
  • Healing time: 8-12 weeks typically
  • Union rate: greater than 95% with proper technique

TTO Closure Pearls

  • Fragment must be long enough (8-10cm) to allow secure fixation
  • Lateral soft tissue hinge must remain intact
  • Avoid proximal migration during closure
  • Non-union rate increases with poor fixation, smoking, diabetes

Complications

Tibial Revision TKA Complications

Post-operative Care

Weight-Bearing

  • Standard revision: WBAT with walker/crutches
  • With TTO: WBAT in extension brace, limit flexion to 90° for 6 weeks
  • Type 3/structural graft: Protected weight-bearing per surgeon discretion

Bracing

  • TTO: Extension brace for 6 weeks, hinged brace 6-12 weeks
  • VVC/Rotating hinge: Consider brace for soft tissue healing
  • Instability concerns: Hinged brace until stable

Thromboprophylaxis

  • LMWH or DOAC - 35 days per Australian guidelines
  • Mechanical prophylaxis - IPC devices while inpatient
  • Early mobilization - Day 1 post-operatively

Rehabilitation

  • Phase 1 (0-6 weeks): ROM exercises, quadriceps strengthening, gait training
  • Phase 2 (6-12 weeks): Progressive strengthening, stair training, balance
  • Phase 3 (12+ weeks): Return to activities, functional training

Follow-up Imaging

  • 6 weeks: AP and lateral - assess component position, TTO healing
  • 3 months: Weight-bearing films
  • Annual: Long-term surveillance

Exam Pearl

Revision TKA Rehab: Recovery slower than primary TKA. Set appropriate expectations - 12 months to maximal improvement. Functional outcomes inferior to primary TKA - most achieve 100-110° flexion.

Exam Viva Scenarios

Practice these scenarios to excel in your viva examination

VIVA SCENARIOStandard

EXAMINER

"A 68-year-old woman presents with progressive medial knee pain 8 years after primary TKA. Radiographs show medial tibial collapse with varus deformity and a radiolucent line under the entire tibial tray. CRP and ESR are normal. How would you assess and manage this patient?"

EXCEPTIONAL ANSWER
This patient has aseptic loosening of her tibial component with varus collapse suggesting medial bone loss. My systematic approach: **Pre-operative Assessment**: 1. **Confirm aseptic loosening**: Repeat CRP/ESR, consider knee aspiration (synovial WCC, PMN%, alpha-defensin) to definitively rule out infection 2. **Imaging**: Weight-bearing AP/lateral, long-leg alignment film, CT scan to quantify bone loss 3. **Classify bone loss**: From description, this is likely AORI Type 2A (unilateral medial condylar loss) or Type 2B (bilateral metaphyseal involvement) **Surgical Planning**: - Previous incision - use most lateral if multiple - Plan for tibial component removal - likely well-fixed, have extraction tools ready - Template for augments/sleeves based on CT assessment - Determine constraint level - probably need VVC given varus collapse suggests medial soft tissue attenuation **Intraoperative Strategy**: 1. Standard medial parapatellar approach (or TTO if difficult exposure) 2. Remove tibial component and all cement 3. Classify bone loss definitively: - Type 2A: Medial metal augment + stemmed tibial + PS or VVC - Type 2B: Tibial sleeve or cone + stemmed tibial + VVC likely 4. Restore joint line - 10-15mm below inferior patella 5. Stem must bypass defect by 2 cortical diameters 6. Trial and assess stability - select appropriate constraint **Key Points**: Confirm aseptic, classify bone loss, restore joint line, appropriate constraint.
VIVA SCENARIOStandard

EXAMINER

"You are performing revision TKA for tibial loosening. After removing the tibial component, you find bilateral metaphyseal bone loss with a compromised medial and lateral cortical rim. The diaphyseal bone is healthy. How do you classify this and what are your reconstruction options?"

EXCEPTIONAL ANSWER
This is **AORI Type 2B** tibial bone loss - bilateral metaphyseal involvement with compromised cortical rim bilaterally but intact diaphysis. **Reconstruction Options**: **Option 1: Tibial Sleeve (Preferred)** - **Mechanism**: Press-fit circumferential metaphyseal engagement with porous ingrowth surface - **Technique**: - Ream metaphysis to accept sleeve - Impact sleeve to final position - Insert press-fit stem through sleeve - Cement baseplate to sleeve surface - **Advantages**: Biologic fixation, load sharing, predictable joint line restoration - **Considerations**: Requires some bone removal during preparation **Option 2: Metaphyseal Cone** - **Mechanism**: Impaction fit into contained defect with cancellous bone ingrowth - **Technique**: - Size cone to fit defect - Impact cone into metaphysis - Cement baseplate on top - Stem through cone for additional stability - **Advantages**: Fills large cavitary defects, less bone removal than sleeve - **Considerations**: Requires reasonably contained defect, technique dependent **My Preference**: Tibial sleeve for Type 2B defects because: 1. Predictable circumferential metaphyseal engagement 2. Reproducible joint line restoration 3. Excellent mid-term survivorship data (greater than 95% at 5 years) 4. Platform for cemented baseplate on top **Additional Considerations**: - Stem: 100-150mm press-fit, must bypass defect by 2 cortical diameters - Constraint: VVC likely needed - bilateral metaphyseal loss often associated with collateral laxity - Joint line: Restore to 10-15mm below inferior patella using appropriate sleeve size
VIVA SCENARIOStandard

EXAMINER

"During revision TKA, you are having difficulty everting the patella due to extensive scarring. You are concerned about patellar tendon avulsion. What are your options and how would you decide?"

EXCEPTIONAL ANSWER
This is a common scenario in revision TKA. Forced patellar eversion risks patellar tendon avulsion, which is a catastrophic complication with poor outcomes. My systematic approach: **Immediate Actions**: 1. **Stop and reassess** - Do not force eversion 2. **Additional releases** - Medial and lateral gutters, suprapatellar pouch 3. **Lateral subluxation** - May provide adequate exposure without eversion **If Still Inadequate - Extensile Exposure Options**: **Quadriceps Snip (First choice):** - **Technique**: 45-degree oblique cut into quadriceps tendon from proximal arthrotomy - **Advantages**: Easy, minimal morbidity, simple closure - **Allows**: 3-4cm additional exposure - **My first choice** if additional exposure needed **Tibial Tubercle Osteotomy (If more needed):** - **Technique**: - Mark osteotomy 8-10cm from tubercle to distal - Width 1-2cm, depth to posterior cortex - Osteotomize with oscillating saw, hinge on lateral periosteum - Elevate proximally with extensor mechanism attached - **Advantages**: Excellent exposure, preserves extensor mechanism continuity - **Closure**: Cerclage wires (2-3) or screws - **Union rate**: greater than 95% **Rectus Snip (Alternative):** - **Technique**: Inverted V-plasty in quadriceps tendon - **Advantages**: Good exposure - **Disadvantages**: More difficult closure, weakens extensor mechanism **Decision Algorithm**: 1. Try lateral subluxation first 2. If inadequate → Quadriceps snip 3. If still inadequate or high-risk extensor mechanism → TTO **High-risk situations favoring TTO:** - Prior extensor mechanism surgery - Multiple previous revisions - Very stiff knee (less than 60° flexion pre-op) - Previous wound complications **Post-TTO Protocol**: WBAT in extension brace, limit flexion to 90° for 6 weeks, expect union by 8-12 weeks.

References

  1. Engh GA, Ammeen DJ. Bone loss with revision total knee arthroplasty: defect classification and alternatives for reconstruction. Instr Course Lect. 1999;48:167-175.

  2. Morgan-Jones R, Oussedik SI, Graichen H, Haddad FS. Zonal fixation in revision total knee arthroplasty. Bone Joint J. 2015;97-B(2):147-149.

  3. Whiteside LA. Cementless revision total knee arthroplasty. Clin Orthop Relat Res. 2006;446:140-148.

  4. Australian Orthopaedic Association National Joint Replacement Registry (AOANJRR). Annual Report 2023. Knee revision outcomes and survival data.

  5. Dalury DF, Adams MJ. Tibial tubercle osteotomy during revision total knee arthroplasty. J Arthroplasty. 2013;28(1):33-37.

  6. Haidukewych GJ, Hanssen A, Jones RD. Metaphyseal fixation in revision total knee arthroplasty: indications and techniques. J Am Acad Orthop Surg. 2011;19(6):311-318.

  7. Potter GD III, Abdel MP, Lewallen DG, Hanssen AD. Midterm results of porous tantalum femoral cones in revision total knee arthroplasty. J Bone Joint Surg Am. 2016;98(15):1286-1291.

  8. Graichen H, Scior W, Strauch M. Direct, cementless, metaphyseal fixation in knee revision arthroplasty with sleeves - short-term results. J Arthroplasty. 2015;30(12):2256-2259.

  9. Fehring TK, Odum S, Oleksy C, et al. Stem fixation in revision total knee arthroplasty: a comparative analysis. Clin Orthop Relat Res. 2003;416:217-224.

  10. Lee JK, Lee S, Kim D, et al. Revision total knee arthroplasty with varus-valgus constrained prosthesis versus rotating-hinge prosthesis. Knee Surg Sports Traumatol Arthrosc. 2020;28(2):518-524.

Revision TKA Tibial Component - Exam Summary

High-Yield Exam Summary