1病例介绍患者，女，29岁，于1999年2月因左手皮肤癌侵及骨质而截肢术后放疗。自述于20年前双手背及掌指关节区常不明原因被损，出血。经久不愈，局部皮肤过度角化，曾按皮肤病，手癣、鹅家风等治疗时好时坏。1997年底发现左手小指无痛性任何方向活动自如，任意弯曲，局部皮肤 1 Case Introduction The patient, female, was 29 years old and was treated with radiotherapy after amputation on February 1999 due to left skin cancer invading bone. After 20 years of self-assessment, the joints in the dorsal and metacarpophalangeal joints of the hands were often damaged and bleeding was unknown. Long-term unhealed, hyperkeratosis local skin, once according to the skin disease, hand ringworm, goose home wind and other treatments are good or bad. At the end of 1997, it was found that the left hand pinkie was free of pain in any direction and was free to flex, with local skin.