C sign incidence C sign figuration distance of the medial facet of talocalcaneal joint and the figuration of sustentaculum tali were studied . The relationship between C sign and talocalcaneal coalition was analysed .

研究C征检出率、C征形态、跟距内关节间距和 跟骨 载 距 突的形态，分析C征与跟距联合的关系。

The Projection of Sustentaculum Tali on the Lateral Wall of the Calcaneus and Its Clinical Significance

载 距 突在 跟骨外侧壁的投影及临床意义

Downward of the sustentaculum tali was 67.5 % ( 285 / 422 ) in positive C sign cases .

C征阳性 者 载 距 突 下陷达67.5%（ 285/422）。