Extensor pollicis brevis tendon can hyperextend thumb interphalangeal joint in absence of extensor pollicis longus:Case report and review of the literature

• 作者: Carolyn B Strauch Robert J Strauch
• 来源期刊: 世界骨科杂志
• 学科: 医学
• 关键词: EXTENSOR pollicis brevis EXTENSOR pollicis longus TENDON RUPTURE EXTENSOR pollicis longus TENDON RUPTURE
• 年，卷（期）: 2016,（7）
• 页码范围: 448-451
• 页数: 4页
• 分类号: R

摘要

We are reporting a case of extensor pollicis longus tendon rupture which did not require tendon transfer owing to the ability of the intact extensor pollicis brevis(EPB)to fully hyperextend the thumb interphalangeal joint.The thumb metacarpophalangeal joint was also able to be fully actively extended by the EPB.Previous anatomical studies have demonstrated that the insertional anatomy of the EPB tendon is highly variable and sometimes inserts onto the extensor hood and distal phalanx,which is likely the mechanism by which our patient was able to fully extend the thumb interphalangeal joint.Despite the potential for the EPB to extend the IP joint of the thumb,virtually all previously reported cases of extensor pollicis longus(EPL)tendon rupture had deficits of thumb IP extension requiring tendon transfer.This case highlights the potential ability of the EPB tendon to completely substitute for the function of the EPL tendon in providing thumb IP joint extension.