Gillet H G
Clin Orthop Relat Res. 1979 Jul-Aug(142):103-9.
The soft corn is defined as an interdigital hyperkeratosis. Footwear contributes to interdigital corns when there is a congenital or acquired predisposing factor. These predisposing factors cause apposition of particular bony prominences between adjacent toes. The congenital factors include a short first metatarsal, a short fifth metatarsal, or third and fourth metatarsals of equal length. The acquired predisposing factors are hallux valgus and associated abduction, hammer deformity, burrowing and curling of the lesser toes. Sixty-five per cent of the 1,063 interdigital corns studied occurred in the fourth interspace. Seventy per cent of the fourth interspace corns occurred between the proximal interphalangeal joint of the fourth toe and distal interphalangeal joint of the fifth toe. Conservative treatment is recommended for most cases.
软性鸡眼被定义为指间角化过度。当存在先天性或后天性易感因素时，鞋类会导致指间鸡眼。这些易感因素会使相邻脚趾之间特定的骨突相互靠近。先天性因素包括第一跖骨短、第五跖骨短或第三和第四跖骨长度相等。后天性易感因素有拇外翻及相关外展、锤状畸形、小趾内翻和卷曲。在研究的1063例指间鸡眼病例中，65%发生在第四间隙。第四间隙鸡眼的70%发生在第四趾的近端指间关节和第五趾的远端指间关节之间。大多数病例建议采用保守治疗。
