Beckly D E, Anderson P W, Pedegana L R
Clin Radiol. 1975 Jul;26(3):333-41. doi: 10.1016/s0009-9260(75)80072-9.
Congenital talo-calcaneal coalition is one of the conditions responsible for spastic flat foot. The common site is across the middle talo-calcaneal joint, and although routine radiographic views of the foot do not show the coalition, important secondary signs may be present. The findings in 17 cases are reviewed, the following secondary signs being recognised: 1. A talar beak. 2. Narrowing of the posterior talo-calcaneal joint space. 3. Rounding of the lateral process of the talus. 4. Failure of visualisation of the middle subtalar joint in the lateral view, and 5. Asymmetry of the anterior subtalar joints in the lateral oblique vies. The differential diagnosis of these signs is discussed and the normal anatomy of the subtalar joints is illustrated. Some diagnostic pitfalls are described.
先天性距跟融合是导致痉挛性平足的病因之一。常见部位是在距跟中关节，虽然足部常规X线片不能显示融合情况，但可能会出现重要的继发性征象。本文回顾了17例患者的检查结果，确认了以下继发性征象：1. 距骨喙；2. 距跟后关节间隙变窄；3. 距骨外侧突变圆；4. 侧位片上中距下关节显示不清；5. 斜位片上距下前关节不对称。文中讨论了这些征象的鉴别诊断，并展示了距下关节的正常解剖结构。还描述了一些诊断误区。
