Pratt R K, Hoy G A, Bass Franzcr C
The Melbourne Orthopaedic Group, 33 The Avenue, Windsor, Victoria 3181, Australia.
Hand Surg. 2004 Dec;9(2):137-43. doi: 10.1142/s0218810404002212.
Dislocation or subluxation of the extensor carpi ulnaris (ECU) tendon is one of the differential diagnoses of ulnar-sided wrist pain. No data exists on the degree of subluxation occurring in normal wrists. Retrospective review of surgical cases revealed two patients with dorsal and four with volar instability. Magnetic resonance imaging and ultrasound were not always predictive of the direction of instability. A standardised ultrasound technique was used to evaluate ECU subluxation in 20 asymptomatic wrists. In normal subjects, as a percentage of the width of the osseous groove, the volar edge of extensor carpi ulnaris may displace by up to 40% beyond the volar lip of the osseous groove with wrist flexion and the dorsal edge by 33% beyond the dorsal lip with wrist extension. The effect of gender on normal range and the diagnostic use of the standardised ultrasound technique need further evaluation.
尺侧腕伸肌（ECU）肌腱脱位或半脱位是尺侧腕部疼痛的鉴别诊断之一。目前尚无关于正常腕部发生半脱位程度的数据。对手术病例的回顾性研究发现，有2例患者存在背侧不稳定，4例患者存在掌侧不稳定。磁共振成像和超声并不总是能够预测不稳定的方向。采用标准化超声技术对20例无症状腕部进行尺侧腕伸肌半脱位评估。在正常受试者中，以骨沟宽度的百分比计算，腕关节屈曲时尺侧腕伸肌的掌侧边缘可超出骨沟掌侧唇缘达40%，腕关节伸展时背侧边缘可超出背侧唇缘达33%。性别对正常范围的影响以及标准化超声技术的诊断应用需要进一步评估。
