Seaman F A, Albert W J, Weldon N R E, Croll J, Callaghan J P
Faculty of Kinesiology, University of New Brunswick, Fredericton, NB, Canada.
Work. 2010;35(1):39-48. doi: 10.3233/WOR-2010-0956.
The number of workplace shoulder compensation claims resulting from musculoskeletal disorders (MSDs) has decreased slightly in recent years, however the median number of days off work remains unchanged, which suggests an increase in injury severity. Little information is available regarding cumulative shoulder exposures, and there is no information on their impact on shoulder pain.
Seventy-nine automotive seat frame assembly workers completed a questionnaire about the prevalence and severity of shoulder pain and were videotaped performing assembly tasks. 3DMatch, a posture-matching software program, was used to calculate the peak and cumulative shoulder moments and forces by matching postures seen in the video with predetermined ranges of posture to be used in the biomechanical model.
Of the 45.6% who reported shoulder pain, there was a mild correlation of pain severity with posterior shear of the shoulder. There were no significant differences in peak loads between Pain and No Pain groups; however, the No Pain group experienced significantly more cumulative caudal shear.
Although there was no difference in percent time spent in different flexed postures between pain groups, those working some jobs may be at an increased risk of developing MSDs based on the amount of time spent in flexed postures, as well as the peak flexion moment acting on the shoulder.
近年来，因肌肉骨骼疾病（MSD）导致的工作场所肩部赔偿索赔数量略有下降，但平均缺勤天数保持不变，这表明损伤严重程度有所增加。关于累积肩部暴露的信息很少，也没有关于其对肩部疼痛影响的信息。
79名汽车座椅框架装配工人完成了一份关于肩部疼痛患病率和严重程度的问卷，并在执行装配任务时进行了录像。使用3DMatch（一种姿势匹配软件程序），通过将视频中看到的姿势与生物力学模型中使用的预定姿势范围进行匹配，来计算肩部的峰值和累积力矩及力。
在报告有肩部疼痛的45.6%的人中，疼痛严重程度与肩部后剪切力之间存在轻度相关性。疼痛组和无疼痛组之间的峰值负荷没有显著差异；然而，无疼痛组经历的累积尾侧剪切力明显更多。
尽管疼痛组之间在不同屈曲姿势下花费的时间百分比没有差异，但根据在屈曲姿势下花费的时间以及作用在肩部的峰值屈曲力矩，从事某些工作的人可能患MSD的风险增加。
