4 ? nothing but from biomechanics side , it is acceptable between introversion 6 degree and exstrophy 1 0 degree after osteotomy 4 、单纯从生物力学的角度阐述，截骨矫形在内翻6 ”至外翻10 ”之间是可以接受的。
2.
3 , stress on the outer side of knee increased little from 0 to 12 degree and increased obviously when the angle greater than 20 degree according to the enlargement of angle of exstrophy . stress mainly concentrated outside of the tibial plateau and center and inboard of the complex 3 、随着膝关节外翻角度逐渐增加，在最初12内应力值变化不大，外翻大于20后应力开始变化较明显，应力主要集中于外侧胫骨平台和外侧复合体中心及内侧。
3.
3 ^ the easiest damage area is outside of the tibial plateau and center and inboard of the complex according to the enlargement of the angle of exstrophy . exstrophy greater than 20 degree is possible critical angel of the beginning of damage and the precaution of complication after osteotomy 3 、随膝关节外翻角度增加，最易受损伤的部位位于外侧胜骨平台和外侧复合体中心和内侧，外翻大于20 ”可能为外翻应力破坏和截骨预防的临界角度。
