Objective In order to provide reference data for the rotational alignment of the distal femur in the total knee arthroplasty,we measured the posterior condylar angles (PCA) of 40 distal femur bone specimens with multi - detector row CT. Methods 40 distal femur bone specimens were scanned by Multi - Detector row CT and being reconstructed on the GE AW4. 2 workstation with the 0. 625mm - gap layer thick. The posterior condylar angles (PCA) between the surgicalepicondylar axis and the posterior condylar line(PCL) were measured, and the data was compared with the standard in the west. Results By means of 16 -slice spiral CT scanning; the average degree of the right PCA was 3. 35 ± 1. 23° ,the left 3. 69 ± 1. 25° ,and the average degree of the PCA for both sides was 3. 51 ± 1. 24°(0. 6° -6. 3°). No statistically significant difference was found between right and left femoral samples. Conclusion In summary, surgery of distal femoral osteotomy can be performed according to the traditional Western theory if there is no serious knee joint varus and valgus deformity and the distal femur posterior condyle is complete. In addition, The pre -operative CT reconstruction of the distal femur and the measurements of the posterior condylar angle would help surgeons determine accurate rotational alignment.%目的 应用多排螺旋CT测量40根国人股骨标本的后髁角,为国人行全膝关节置换术时的旋转对线提供参考数据.方法 应用多排螺旋CT对40根股骨标本的远端部位薄层扫描(0.625mm),数据传入AW4.2工作站应用三维重建技术进行后处理,选取股骨内、外上髁层面图像,作后髁角测定,并与西方人数据比对.结果 右侧股骨22根后髁角平均为(3.35±1.23)°,左侧股骨18根后髁角平均为(3.69±1.25)°,左右两侧股骨40根后髁角0.6°～6.3°,平均为(31.5±1.24)°左右两侧股骨后髁角差异无统计学意义(P>0.05).结论 在膝关节无严重内外翻畸形及股骨远端后髁完整的情况下,仍可按照传统的西方人股骨后髁外旋3°理论行股骨远端截骨;术前应用多排螺旋CT测量股骨后髁角,有利于术中重建准确的旋转力线.
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