This study investigated the muscle strength and performance fatigability of the forearms in eight male orthopaedic surgeons when performing bone screw fixations. Each surgeon performed an eight-bone screws operations in a porcine femur model to simulate fractural fixation using plating technique. The pre- and post-fatigue maximum isometric forces and corresponding electromyography responses were measured to assess the forearm muscle strength loss and fatigue due to screwing. Results showed that after eight bone screws were inserted, the maximal grip force, maximal driving torque and maximal push force losses were approximately 29%, 20% and 23%, respectively. While the grip force and/or driving torque acting, both the brachioradialis and extensor carpi ulnaris had a higher percentage change of EMG than the biceps brachii. The driving forces decreased with the number of screw insertions; however, the insertion time increased parabolically with the number of screws and significantly decreased the insertion rate of the screws, indicating that forearm muscle fatigue may occur in surgeons who treat fracture fixation using more than eight bone screws.

这项研究调查了八名男性骨科外科医生在进行接骨螺钉固定时的前臂的肌肉力量和表现疲劳性。每位外科医生在猪股骨模型中执行八骨螺钉手术，以模拟使用电镀技术的骨折固定。测量了疲劳前后的最大等轴测力和相应的肌电图反应，以评估前臂肌肉力量损失和拧紧后的疲劳。结果显示，在插入八个骨螺钉后，最大抓力，最大驱动扭矩和最大推力损失分别约为29％，20％和23％。当抓握力和/或驱动扭矩起作用时，腕肱肌和尺腕腕腕肌的肌电图变化百分比均高于肱二头肌。驱动力随着螺钉插入数量的减少而降低；但是，插入时间随着螺钉数量的增加而呈抛物线增加，并且螺钉的插入率显着降低，这表明在使用八颗以上骨螺钉治疗骨折固定的外科医生中，前臂肌肉可能会发生疲劳。