结论经胫后肌腱鞘的踝关节镜后方共轴入路，具有操作简便、安全性好、镜下视野清楚、操作空间大的优点。

Conclusions The posterior coaxial portals via PTT sheath for ankle arthroscopy have such advantages as easy maneuverability, superior safety, clear vision and larger operation field under arthroscopy.

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目的评估改进的踝关节镜后方共轴入路的安全性和可操作性。

Objective the purpose of this study is to evaluate the safety and operation of a modified coaxial portals for posterior ankle arthroscopy.

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