Rehder U
J Biomech. 1983;16(5):351-61. doi: 10.1016/0021-9290(83)90019-2.
The curvature of the tibial part of the femoral condyles in the sagittal plane can be described by mathematical spirals: involutes of a circle. Archimedean and logarithmic spirals. In the order of the accuracy of measurement (+/- 0.2 mm) the curvature can be described by all three spirals.
圆的渐开线、阿基米德螺旋线和对数螺旋线。按照测量精度（±0.2毫米），所有这三种螺旋线均可描述该曲率。
