Olney R K, Wilbourn A J
Arch Phys Med Rehabil. 1985 Jan;66(1):16-8.
Ulnar neuropathy at or distal to the wrist is difficult to diagnose. Sensation is normal in the majority of cases, and the interosseous muscles are usually more severely involved than are the hypothenar muscles. A technique for ulnar nerve conduction study of the first dorsal interosseous muscle is described, and normal values based upon 373 studies are presented. Using this technique the upper limit for distal motor latency (DML) to the first dorsal interosseous (FDI) muscle is 4.5 ms. More precisely, DML to the FDI should not exceed DML to the contralateral FDI by more than 1.3 ms, nor should this value exceed the DML to the ipsilateral abductor digiti minimi by more than 2.0 ms. The lower limit for amplitude of the compound muscle action potential recorded over FDI is 6mV. If motor conduction study of the first dorsal interosseous muscle is more routinely performed, earlier and more frequent recognition could be followed by improved surgical remediation of this compression neuropathy.
腕部或其远端的尺神经病变难以诊断。在大多数病例中感觉正常，骨间肌通常比小鱼际肌受累更严重。本文描述了一种用于第一背侧骨间肌的尺神经传导研究技术，并给出了基于373项研究的正常值。使用该技术，第一背侧骨间肌（FDI）的远端运动潜伏期（DML）上限为4.5毫秒。更确切地说，FDI的DML不应比对侧FDI的DML超过1.3毫秒，也不应比同侧小指展肌的DML超过2.0毫秒。FDI记录的复合肌肉动作电位幅度下限为6毫伏。如果更常规地进行第一背侧骨间肌的运动传导研究，那么更早且更频繁地识别这种压迫性神经病变，随后可改善其手术治疗效果。
