Yeo Jungho, Kim Yuntae, Kim Sooa, Oh Kiyoung, Kang Hyungdong
Department of Rehabilitation Medicine, Soonchunhyang University Cheonan Hospital, Soonchunhyang University College of Medicine, Cheonan, Korea.
Department of Rehabilitation Medicine, Soonchunhyang University Bucheon Hospital, Soonchunhyang University College of Medicine, Bucheon, Korea.
Ann Rehabil Med. 2017 Apr;41(2):290-298. doi: 10.5535/arm.2017.41.2.290. Epub 2017 Apr 27.
To obtain reference values, to suggest optimal recording and stimulation site for radial motor nerve conduction study (RmNCS), and to analyze the correlation among RmNCS parameters, demographics and ultrasonography (US) findings.
A total of 55 volunteers participated in this study. We hypothesized that 'lateral edge of spiral groove (A)' was the optimal stimulation site, and the 'largest cross-sectional area (CSA) of extensor indicis proprius (EIP) muscle (B)' was the optimal recording site. The surface distance between 'A' and the lateral epicondyle of the humerus divided by upper arm length, was named the spiral groove ratio. The surface distance between 'B' and the ulnar styloid process divided by forearm length, was named the EIP ratio. Using US, we identified these sites, and further conducted RmNCS.
Data was collected from 100 arms of the 55 volunteers. Mean amplitude and latency were 5.7±1.1 mV and 5.7±0.5 ms, respectively, at the spiral groove, and velocity between elbow and spiral groove was 73.7±7.0 m/s. RmNCS parameters correlated significantly with height, weight, arm length, and CSA of the EIP muscle. Spiral groove ratio and EIP ratio were 0.338±0.03 and 0.201±0.03, respectively; both values were almost the same, regardless of age, sex and handedness.
We established a reference value and standardized method of RmNCS using US. Optimal RmNCS can be conducted by placing the recording electrode 20% (about one-fifth) of forearm length from the ulnar styloid process, and stimulating at 34% (about one-third) of the humeral length from the lateral epicondyle.
获取参考值，为桡神经运动神经传导研究（RmNCS）建议最佳记录和刺激部位，并分析RmNCS参数、人口统计学特征与超声（US）检查结果之间的相关性。
共有55名志愿者参与本研究。我们假设“螺旋沟外侧缘（A）”是最佳刺激部位，“示指固有伸肌（EIP）肌肉的最大横截面积（CSA）（B）”是最佳记录部位。“A”与肱骨外上髁之间的体表距离除以上臂长度，称为螺旋沟比值。“B”与尺骨茎突之间的体表距离除以前臂长度，称为EIP比值。我们使用超声确定这些部位，并进一步进行RmNCS。
从55名志愿者的100条手臂收集了数据。在螺旋沟处，平均波幅和潜伏期分别为5.7±1.1 mV和5.7±0.5 ms，肘部与螺旋沟之间的速度为73.7±7.0 m/s。RmNCS参数与身高、体重、手臂长度和EIP肌肉的CSA显著相关。螺旋沟比值和EIP比值分别为0.338±0.03和0.201±0.03；无论年龄、性别和利手情况如何，这两个值几乎相同。
我们使用超声建立了RmNCS的参考值和标准化方法。通过将记录电极置于距尺骨茎突前臂长度的20%（约五分之一）处，并在距肱骨外上髁肱骨长度的34%（约三分之一）处进行刺激，可进行最佳的RmNCS。
