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Revision Total Knee Arthroplasty (TKA) — Advanced Bone Loss Reconstruction

Complex re-do knee arthroplasty in the setting of severe AORI type 2B / type 3 femoral and tibial bone defects, addressed with metaphyseal cones and sleeves (porous tantalum, titanium 3D-printed), structural allograft, megaprosthesis, and constrained or hinged implants.

Written by: Saygı Hospital Health Guide Editorial Board
Last updated:

This content has been compiled by the Saygı Hospital Health Guide Editorial Board and is periodically reviewed by a specialist physician.

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This content is for informational purposes only and does not constitute medical advice. You can book an appointment at our Ortopedi ve Travmatoloji department. Book Appointment →

What is Revision Total Knee Arthroplasty (TKA) — Advanced Bone Loss Reconstruction?

Revision total knee arthroplasty (rTKA) for severe bone loss is one of the most demanding procedures in adult reconstructive orthopaedics. Bone loss is graded by the Anderson Orthopaedic Research Institute (AORI) classification: Type 1 minor metaphyseal cortical defects (intact metaphyseal segment), Type 2A unilateral metaphyseal segment loss, Type 2B bilateral metaphyseal segment loss, and Type 3 metaphyseal-epiphyseal segmental loss requiring structural augmentation.

Reconstruction strategies are tailored to defect severity. AORI T1: cement, screws, modular metal augments. AORI T2A/T2B: modular wedge/block metal augments combined with metaphyseal sleeves (Zimmer Biomet) or porous tantalum cones (Stryker, Trabecular Metal) or 3D-printed titanium cones (Stryker, DePuy, Smith & Nephew). AORI T3: structural distal femoral or proximal tibial allograft, hybrid augment-cone-stem constructs, or tumor megaprostheses (modular distal femoral / proximal tibial replacement) with rotating-hinge knees.

Implant constraint is escalated to compensate for ligament insufficiency: posterior-stabilized → varus-valgus constrained condylar → rotating-hinge or megaprosthesis. Stem fixation is mandatory, either fully cemented short stems (≥ 30 mm) or cementless press-fit long stems (75–150 mm) into the diaphysis. Goals are durable mechanical stability, joint-line restoration to within 5–8 mm of native, balanced flexion-extension gaps, and mechanical alignment within ± 3°. Recent registry data show 80–90% 10-year survivorship for cone/sleeve constructs and 65–75% for megaprostheses, with ongoing risk of infection, instability and aseptic loosening.

Symptoms

Recurrent knee pain after primary or prior revision TKA
Instability, giving way, recurrent dislocation
Loosening signs on radiographs (radiolucent lines, component migration, polyethylene wear)
Periprosthetic infection (sinus tract, sepsis, elevated CRP/ESR, positive aspiration culture)
Periprosthetic fracture
Limited motion (stiffness, < 90° flexion or > 5° flexion contracture)
Bone loss radiographically classified as AORI T2 or T3

Risk Factors

Aseptic loosening or periprosthetic joint infection
Multiple prior revision surgeries with progressive bone resorption
Osteolysis from polyethylene wear, particle disease
Periprosthetic fracture
Stiffness with prior arthrolysis, manipulation under anesthesia
Tumor or metastatic disease requiring resection
Inflammatory arthritis (RA, AS) with severe deformity

When to See a Doctor?

If you experience any of the following symptoms, seek medical attention promptly:

  • New or worsening knee pain after prior TKA
  • Instability or giving way of replaced knee
  • Audible clunk, grinding or popping
  • Acute swelling, warmth, drainage from incision
  • Fever, chills with knee pain (rule out infection)
  • Inability to bear weight, periprosthetic fracture
  • Loss of motion, stiffness, or progressive deformity

Treatment Methods

01
Pre-op workup: AP/lateral knee X-rays, standing long-leg, oblique, CT for 3D bone-loss mapping; CRP/ESR, joint aspiration with cell count + culture (rule out PJI)
02
Surgical templating: AORI classification, choose constraint level, plan augment/cone/sleeve/allograft inventory, stem length/diameter
03
Two-stage revision for chronic PJI: stage 1 articulating or static spacer with antibiotic-loaded cement (vancomycin/gentamicin), 6–8 weeks IV antibiotics, normalized inflammatory markers, then stage 2 reimplantation
04
Aseptic revision: removal of failed components, debridement, AORI classification, reconstruction with metaphyseal cones (porous tantalum or 3D-printed titanium) ± augments + cemented or press-fit stems
05
AORI T3 / massive bone loss: structural allograft + step-cut osteotomy, or tumor megaprosthesis (Limb Preservation System, GMRS, MUTARS) with rotating-hinge knee
06
Constraint level: VVC for mild instability, rotating-hinge for global instability or megaprosthesis
07
Post-op: protected weight-bearing 6–12 weeks if allograft or extensor mechanism reconstruction, ROM goals 90° by 6 weeks, DVT prophylaxis, multimodal analgesia, infection surveillance, lifelong follow-up

Which Department to Visit?

You can visit our Ortopedi ve Travmatoloji department for these complaints. Our specialist physicians will create the most suitable treatment plan for you.

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Health Disclaimer: The information on this page is prepared for general informational purposes only. It does not replace medical diagnosis and treatment. Please consult your physician for your complaints. Saygı Hospital does not accept responsibility for actions taken based on the information on this page.