O'Driscoll S W, Horii E, Carmichael S W, Morrey B F
Mayo Clinic, Rochester, Minnesota 55905.
J Bone Joint Surg Br. 1991 Jul;73(4):613-7. doi: 10.1302/0301-620X.73B4.2071645.
The anatomy of the cubital tunnel and its relationship to ulnar nerve compression is not well documented. In 27 cadaver elbows the proximal edge of the roof of the cubital tunnel was formed by a fibrous band that we call the cubital tunnel retinaculum (CTR). The band is about 4 mm wide, extending from the medial epicondyle to the olecranon, and perpendicular to the flexor carpi ulnaris aponeurosis. Variations in the CTR were classified into four types. In type 0 (n = 1) the CTR was absent. In type Ia (n = 17), the retinaculum was lax in extension and taut in full flexion. In type Ib (n = 6) it was tight in positions short of full flexion (90 degrees to 120 degrees). In type II (n = 3) it was replaced by a muscle, the anconeus epitrochlearis. The CTR appears to be a remnant of the anconeus epitrochlearis muscle and its function is to hold the ulnar nerve in position. Variations in the anatomy of the CTR may explain certain types of ulnar neuropathy. Its absence (type 0 CTR) permits ulnar nerve displacement. Type Ia is normal and does not cause ulnar neuropathy. Type Ib can cause dynamic nerve compression with elbow flexion. Type II may be associated with static compression due to the bulk of the anconeus epitrochlearis muscle.
肘管的解剖结构及其与尺神经受压的关系尚无充分记载。在27具尸体肘部中，肘管顶部的近端边缘由一条纤维带构成，我们称之为肘管支持带（CTR）。该带约4毫米宽，从内上髁延伸至鹰嘴，并与尺侧腕屈肌腱膜垂直。CTR的变异分为四种类型。在0型（n = 1）中，CTR缺失。在Ia型（n = 17）中，支持带在伸展时松弛，在完全屈曲时紧张。在Ib型（n = 6）中，它在未完全屈曲（90度至120度）的位置时紧张。在II型（n = 3）中，它被一块肌肉，即肱三头肌内侧头所取代。CTR似乎是肱三头肌内侧头肌的残余部分，其功能是将尺神经固定在位。CTR解剖结构的变异可能解释某些类型的尺神经病变。其缺失（0型CTR）会导致尺神经移位。Ia型是正常的，不会引起尺神经病变。Ib型可在肘关节屈曲时导致动态神经受压。II型可能由于肱三头肌内侧头肌的体积而与静态受压有关。
