Elson R A
J Bone Joint Surg Br. 1986 Mar;68(2):229-31. doi: 10.1302/0301-620X.68B2.3958008.
Closed rupture of the middle slip of the extensor hood of a finger is easily missed until the late appearance of a buttonhole deformity. Early diagnosis gives the best chance of satisfactory treatment, but Boyes' test becomes positive only at a late stage. A new test is described in which, from a 90 degree flexed position over the edge of a table, the patient tries to extend the proximal interphalangeal joint of the involved finger against resistance. The absence of extension force at the proximal joint and fixed extension at the distal joint are immediate signs of complete rupture of the central slip. The theoretical basis and the method of performing the test are discussed.
手指伸肌帽中间束的闭合性断裂很容易被漏诊，直到出现纽扣畸形的晚期表现。早期诊断为获得满意治疗提供了最佳机会，但博伊斯试验仅在晚期呈阳性。本文描述了一种新的试验，即患者从桌子边缘90度屈曲位开始，试图对抗阻力伸展患指的近端指间关节。近端关节缺乏伸展力以及远端关节固定伸展是中央束完全断裂的直接征象。文中讨论了该试验的理论基础和操作方法。
