Department of Orthopedic Surgery, Kyungpook National University Hospital, Daegu, Korea.
Clin Anat. 2010 Jan;23(1):56-60. doi: 10.1002/ca.20878.
We report results of anatomic study in the fourth intermetacarpal space, focusing on the pattern of junctura tendinum and variations of extensor tendons of the little finger with its clinical implication on snapping of the little finger. Fifty unpaired cadaveric hands were dissected from the wrist to the middle phalanx of the ring and little fingers. The type of junctura tendinum was judged based on Von Schroder's classification and the relationship with EDC were recorded. EDC to the little finger and EDM were dissected and the numbers were recorded. Forty six hands (92%) exhibited a junctura tendinum in the fourth intermetacarpal space and it was Type III in 42 hands (84%). The EDC-little finger was absent in 76% (38 of 50 hands). When present, EDC-little finger originated most commonly as single thin tendon. The absence of an EDC-little finger was associated with increased incidence of Type III junctura tendinum (37 of 38 hands). An EDM was present in all 50 hands running from the fifth dorsal compartment. Based on these clinical and anatomic studies, we considered that the snapping of the little finger is more likely subluxation of junctura tendinum rather than subluxation/dislocation of EDC of the little finger.
我们报告第四掌骨间空间的解剖学研究结果，重点关注腱结合部的形态和小指伸肌腱的变异及其对小指弹响的临床意义。从腕关节到环指和小指的中节指骨，对 50 具不成对的尸体手进行了解剖。根据冯·施罗德的分类判断腱结合部的类型，并记录与 EDC 的关系。解剖并记录 EDC 至小指和 EDM 的数量。46 只手（92%）在第四掌骨间空间有腱结合部，其中 42 只手（84%）为 III 型。50 只手中有 76%（38 只）没有 EDC 至小指。当存在时，EDC 至小指通常起源于单一的细肌腱。没有 EDC 至小指与 III 型腱结合部的发生率增加（38 只手中有 37 只）相关。所有 50 只手都有一个从第五背侧间隔发出的 EDM。基于这些临床和解剖学研究，我们认为小指弹响更可能是腱结合部的半脱位，而不是小指 EDC 的半脱位/脱位。
