Department of Physical Medicine and Rehabilitation, Korea University College of Medicine, Guro Dong, Seoul, South Korea.
Muscle Nerve. 2011 Oct;44(4):583-6. doi: 10.1002/mus.22131.
Ulnar nerve displacement at the elbow causes overestimation of nerve conduction velocity. We hypothesized that this overestimation may cause false-negative results when the American Association of Neuromuscular and Electrodiagnostic Medicine (AANEM) diagnostic criteria are used.
We investigated 9 cases of ulnar neuropathy at the elbow, all having ulnar nerve displacement confirmed by ultrasonography and meeting none or just one of the AANEM criteria with distance measurement by anatomic landmarks. First, the distance across the elbow segment was measured by anatomic landmarks, and then it was re-estimated by ultrasonography.
Overestimated ulnar conduction velocity was corrected by 7.9 m/s. Three cases met none of the AANEM criteria before correction. After correction of overestimation, all cases met two of the AANEM criteria.
This study highlights the importance of using ultrasonography to confirm the possibility of ulnar nerve displacement, especially when electrodiagnostic findings do not meet AANEM criteria in patients with suspected UNE.
肘部尺神经移位会导致神经传导速度的高估。我们假设，当使用美国神经肌肉与电诊断医学学会（AANEM）的诊断标准时，这种高估可能会导致假阴性结果。
我们研究了 9 例肘部尺神经病，所有病例均经超声证实存在尺神经移位，且无一例或仅一例符合 AANEM 标准，通过解剖标志进行距离测量。首先，通过解剖标志测量肘部节段的距离，然后通过超声重新估计。
通过超声测量发现尺神经传导速度高估了 7.9m/s。有 3 例在未校正前不符合 AANEM 标准中的任何一条。在纠正高估后，所有病例均符合 AANEM 标准中的两条。
本研究强调了使用超声确认尺神经移位可能性的重要性，尤其是在疑似 UNE 患者的电诊断结果不符合 AANEM 标准时。
