Ranawat, Clin Orthop Relat Res 1973 - Duo-Condylar Total Knee Arthroplasty

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Duo-Condylar Total Knee Arthroplasty

Ranawat, Shine·Clin Orthop Relat Res·1973·209 citations·Case series

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Ranawat and Shine describe the design principles, operative technique, and early outcomes of the duo-condylar total knee arthroplasty developed at the Hospital for Special Surgery. This cruciate-retaining, ligament-dependent condylar prosthesis built directly on Gunston's polycentric knee concept. The paper defines the indications, contraindications, and alignment targets that became the template for all subsequent condylar TKA design.

Key Findings

Pain relief was dramatic: 9/20 patients had complete relief and 9/20 had only occasional discomfort; 2 had persistent pain, and the authors urged only cautious use given unknown durability.
ROM ≥90° was achieved in 18/20 patients, and no patient had residual flexion deformity.
Instability improved in all 20 patients, but 2 had persistent moderate instability: one with a stretched, thinned MCL and one with persistent subluxation and AP instability who, the authors judged, would have done better with a stabilizer or hinge prosthesis.
Tibial alignment was the weak link: 4/20 knees had tibial tilt >10°, while femoral seating within the 75°–85° target angle was achieved in every case. Pointing to tibial instrumentation as the priority for future improvement.
Nine contraindications were listed for this design, three with the clearest rationale:
- AP subluxation. Needs a hinge prosthesis or stabilizer
- Recurvatum >10°. Due to posterior capsular laxity
- Flexion contracture >25° under anesthesia. Correction requires resecting much of the femoral condyle, making component seating unsatisfactory

Board PearlThe duo-condylar tibial component provides no anteroposterior stability, so stability depends on the knee's own ligaments; AP subluxation, recurvatum >10°, and flexion contracture >25° (under anesthesia) were listed as contraindications.

Duo-Condylar Total Knee Arthroplasty.

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Duo-Condylar Total Knee Arthroplasty

Ranawat, Shine·Clin Orthop Relat Res·1973·209 citations·Case series

|

Ranawat and Shine describe the design principles, operative technique, and early outcomes of the duo-condylar total knee arthroplasty developed at the Hospital for Special Surgery. This cruciate-retaining, ligament-dependent condylar prosthesis built directly on Gunston's polycentric knee concept. The paper defines the indications, contraindications, and alignment targets that became the template for all subsequent condylar TKA design.

Key Findings

Pain relief was dramatic: 9/20 patients had complete relief and 9/20 had only occasional discomfort; 2 had persistent pain, and the authors urged only cautious use given unknown durability.
ROM ≥90° was achieved in 18/20 patients, and no patient had residual flexion deformity.
Instability improved in all 20 patients, but 2 had persistent moderate instability: one with a stretched, thinned MCL and one with persistent subluxation and AP instability who, the authors judged, would have done better with a stabilizer or hinge prosthesis.
Tibial alignment was the weak link: 4/20 knees had tibial tilt >10°, while femoral seating within the 75°–85° target angle was achieved in every case. Pointing to tibial instrumentation as the priority for future improvement.
Nine contraindications were listed for this design, three with the clearest rationale:
- AP subluxation. Needs a hinge prosthesis or stabilizer
- Recurvatum >10°. Due to posterior capsular laxity
- Flexion contracture >25° under anesthesia. Correction requires resecting much of the femoral condyle, making component seating unsatisfactory

Board PearlThe duo-condylar tibial component provides no anteroposterior stability, so stability depends on the knee's own ligaments; AP subluxation, recurvatum >10°, and flexion contracture >25° (under anesthesia) were listed as contraindications.

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