Does mismatch of the femoral component aspect ratio influence the range of knee flexion after posterior-stabilized total knee arthroplasty?

JIA Yu-tao; WANG Lei; ZHANG Yu; ZHAO Cong; SUN Zhen-hui; LIU Jun

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Does mismatch of the femoral component aspect ratio influence the range of knee flexion after posterior-stabilized total knee arthroplasty?

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Objective: To study whether the range of knee flexion (ROF) is affected by geometrical mismatch of the femoral component and the resultant change in the posterior condylar offset (PCO) after high-flexion posterior-stabilized total knee arthroplasty (TKA).Methods:One hundred osteoarthritic patients (50 males and 50 females) underwent femoral osteotomy by the anterior referencing technique.The PCO for each patient was measured from lateral radiographs before,during and 2 years after TKA.The thickness of the joint cartilage was measured by magnetic resonance imaging before TKA and added onto the radiographic measurement.The relationship between changes in the PCO and improvements in the ROF before,during and 2 years after TKA were statistically analyzed.Results: Compared with the preoperative value,the PCO was reduced by (3.45±3.28) mm after TKA,with a significantly larger reduction observed in female patients than male patients (P＜0.05).When examining the subject population as a whole,there was a significant positive correlation between PCO and ROF improvement during TKA (P＜ 0.05),but this improvement was not maintained 2 years after TKA (P＞0.05).However,when male and female patients were analyzed separately,there was a significant positive correlation between PCO change and ROF improvement for both sexes at both time points (all P＜0.05).Conclusions: Restoration of PCO plays an important role in the optimization of knee flexion even after posteriorstabilized TKA.Femoral components based on Caucasian anatomic characteristics could not match the native anatomy of distal femurs in Chinese population especially female Chinese.Rotated resection of distal femur with anterior referencing technique usually leads to a decreased PCO and therefore reduces maximal obtainable flexion.

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《中华创伤杂志（英文版）》 |2012年第3期|152-157|共6页
作者
JIA Yu-tao; WANG Lei; ZHANG Yu; ZHAO Cong; SUN Zhen-hui; LIU Jun;
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Department of Orthopedics, Tianjin Union Medical Centre, Tianjin 300121, China;

Department of Orthopedics, Tianjin Union Medical Centre, Tianjin 300121, China;

Department of Orthopedics, Tianjin Union Medical Centre, Tianjin 300121, China;

Department of Orthopedics, Tianjin Union Medical Centre, Tianjin 300121, China;

Department of Orthopedics, Tianjin Union Medical Centre, Tianjin 300121, China;

Department of Orthopedics, Tianjin Union Medical Centre, Tianjin 300121, China;

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Does mismatch of the femoral component aspect ratio influence the range of knee flexion after posterior-stabilized total knee arthroplasty?

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