Rempel D, Keir P J, Smutz W P, Hargens A
Department of Medicine, University of California-San Francisco 94804, USA.
J Orthop Res. 1997 May;15(3):422-6. doi: 10.1002/jor.1100150315.
The purpose of this study was to explore the relationship between carpal tunnel pressure and fingertip force during a simple pressing task. Carpal tunnel pressure was measured in 15 healthy volunteers by means of a saline-filled catheter inserted percutaneously into the carpal tunnel of the nondominant hand. The subjects pressed on a load cell with the tip of the index finger and with 0, 6, 9, and 12 N of force. The task was repeated in 10 wrist postures: neutral; 10 and 20 degrees of ulnar deviation; 10 degrees of radial deviation; and 15, 30, and 45 degrees of both flexion and extension. Fingertip loading significantly increased carpal tunnel pressure for all wrist angles (p = 0.0001). Post hoc analyses identified significant increase (p < 0.05) in carpal tunnel pressure between unloaded (0 N) and all loaded conditions, as well as between the 6 and 12 N load conditions. This study demonstrates that the process whereby fingertip loading elevates carpal tunnel pressure is independent of wrist posture and that relatively small fingertip loads have a large effect on carpal tunnel pressure. It also reveals the response characteristics of carpal tunnel pressure to fingertip loading, which is one step in understanding the relationship between sustained grip and pinch activities and the aggravation or development of median neuropathy at the wrist.
本研究的目的是探讨在一项简单按压任务中腕管压力与指尖力之间的关系。通过经皮插入非优势手腕管的充生理盐水导管，对15名健康志愿者的腕管压力进行测量。受试者用食指指尖以0、6、9和12 N的力按压称重传感器。该任务在10种腕部姿势下重复进行：中立位；尺侧偏斜10度和20度；桡侧偏斜10度；以及屈曲和伸展15度、30度和45度。对于所有腕部角度，指尖加载均显著增加了腕管压力（p = 0.0001）。事后分析确定，在无负载（0 N）与所有负载条件之间，以及在6 N和12 N负载条件之间，腕管压力有显著增加（p < 0.05）。本研究表明，指尖加载升高腕管压力的过程与腕部姿势无关，并且相对较小的指尖负载对腕管压力有很大影响。它还揭示了腕管压力对指尖加载的反应特性，这是理解持续抓握和捏取活动与腕部正中神经病变加重或发展之间关系的一个步骤。
