论
1．在外翻患者中，内侧足纵弓存在着塌陷。
2．外翻畸形和内侧足纵弓塌陷有一定的相关性，两者呈正相关。初步的研究证实两之之间互相影响，有彼此加重畸形的发生发展的作用。外翻畸形由于第一跖列的解剖功能异常 ，削弱了跖筋膜对足纵弓的维持作用，导致内侧足纵弓前臂的塌陷，而跟骨的外翻有加重足纵弓塌陷的作用。平足中由于踝关节的外翻及距下关节的旋前外翻，致前足不稳，第一跖列活动度增加，对外翻的发生发展亦有一定的影响。
3．认识到外翻足中的足纵弓塌陷对外翻的治疗有一定的参考意义。对术前检查发现有足纵弓塌陷的外翻患足，在手术时应考虑到足纵弓的重建，如在第一跖骨基底截骨纠正第一跖骨内翻的同时，将第一跖骨旋后、下压，则有助于恢复第一跖列周围软组织的正常解剖，在一定程度上重建足弓系统，对防止外翻的复发可能有一定的作用，其疗效有待于进一步观察。本发现对足弓垫的设计亦有一定的价值，对早期轻度的外翻患者通过使用足弓垫保持其足横弓及足纵弓的形态可能亦有助于阻止外翻畸形的加重，而这一点亦有待于更进一步的临床工作。
附录（临床资料）
1．外翻足病例1：患者，女，37岁，外翻右足，伴前足胼胝跖痛，外翻角35°，一二跖骨间角16°，胫侧籽骨3度脱位；前弓角10°，内弓顶角136°，距骨相对高度0.156。
图－1 右足正面观
图－2. 右足内侧面观
图－3 右足正位片
图－4. 右足侧位片
2．外翻患足病例2：患者，女，57岁，左足外翻，伴胼胝跖痛，外翻角48.5°，一二跖骨间角15.5°，胫侧籽骨3度脱位；内弓顶角141°，前弓角8°，距骨相对高度0.137。
图－5 左足正面观
图－6 左足负重侧面观
图－7 左足正位X片
图－8 左足负重侧位X片
3．正常足的右足正侧位片，女，54岁，无足部疾患。无跖痛、胼胝及锤状趾。外翻角10°，一二跖间角5°，胫侧籽骨0度°，内弓顶角124°，前弓角14.5°，距骨高度0.200。
图－9 右足正位X片
图－10 右足侧位X片
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