Harding C, Halar E
Arch Phys Med Rehabil. 1983 May;64(5):227-32.
Ulnar motor and sensory nerve conduction velocities (NCV) were studied bilaterally in 20 able-bodied subjects for below elbow (BE) and across elbow (AE) segments to assess the effect of 4 different elbow positions on NCV (0 degrees, 45 degrees, 90 degrees, and 135 degrees). Although constant skin stimulation marker points were used, the AE segment length became progressively longer with increased elbow flexion. At 0 degrees flexion the AE segment motor NCV was found to be slower, and at 45 degrees it was found faster than the BE NCV. At each subsequent elbow flexion position (90 degrees and 135 degrees) there was an erroneous increase in motor and sensory NCV for the AE segments (p less than 0.01). This increase in AE NCV with elbow flexion was mostly due to stretching of skin over the flexed elbow. The nerve itself was observed in 4 cadaver specimens to slide distally with respect to the above elbow skin marker. Since 45 degrees elbow flexion was the position of least variation in motor NCV for AE and BE segments, this degree of elbow flexion appears to be optimum. From these measurements and from literature review neither short AE segment length (less than 10 cm) nor long AE segment length (greater than 15 cm) is optimum for measurement of AE NCV in the assessment of compressive neuropathy at the elbow. Short segments are subject to increased NCV variation while long segments may not detect pathological slowing of NCV only occurring over a short portion of the nerve.
对20名身体健全的受试者双侧研究尺神经运动和感觉神经传导速度（NCV），以评估肘部以下（BE）和肘部以上（AE）节段在4种不同肘部位置（0度、45度、90度和135度）对NCV的影响。尽管使用了固定的皮肤刺激标记点，但随着肘部屈曲增加，AE节段长度逐渐变长。在0度屈曲时，发现AE节段运动NCV较慢，在45度时，发现其比BE节段的NCV快。在随后的每个肘部屈曲位置（90度和135度），AE节段的运动和感觉NCV出现错误增加（p小于0.01）。AE节段NCV随肘部屈曲增加主要是由于屈曲肘部上方皮肤的拉伸。在4个尸体标本中观察到神经相对于肘部上方皮肤标记向远端滑动。由于45度肘部屈曲是AE和BE节段运动NCV变化最小的位置，因此该肘部屈曲程度似乎是最佳的。从这些测量以及文献综述来看，在评估肘部压迫性神经病变时，AE节段长度过短（小于10 cm）或过长（大于15 cm）均不适用于测量AE NCV。短节段的NCV变化增加，而长节段可能无法检测到仅在神经短段出现的NCV病理性减慢。
