Short term influence of mechanical factors on regional musculoskeletal pain: a study of new workers from 12 occupational groups

Objectives-To determine the influence of short term exposure to mechanical factors on regional musculoskeletal pain. Methods-Full time newly employed workers were recruited from 12 occupationa l groups and information collected by questionnaire. Subjects indicated on a blank body manikin any low back, shoulder, wrist or forearm or both, or k nee pain which had occurred during the past month and had lasted more than 1 day. Data were also collected with a previously validated questionnaire o n working postures, manual handling activities, and repetitive movements of the upper limb. The relations between mechanical factors and each area of pain were calculated as odds ratios (ORs) with 95% confidence intervals (95 % CIs). Adjustment was made for age and sex. Results-1081 subjects (median age 23; interquartile range 20-27) were recru ited to the study (a participation rate of 91%). 261 (24%) reported low bac k pain, 221 (20%) shoulder pain, 93 (9%) wrist or forearm pain, and 222 (21 %) knee pain. Several specific manual handling activities were found to be associated with low back, shoulder, and knee pain. Carrying weights of more than 50 lbs (23 kg) on one shoulder was the factor which was most strongly associated with low back pain (OR 2.4 (95% CI 1.5 to 3.8)), shoulder pain (OR 3.1 (95% CI 1.9 to 4.8)), and knee pain (OR 3.5 (95% CI 2.2 to 5.5)), w hereas forearm pain was most strongly associated with repetitive movements of the wrists (OR 1.8 (95% CI 1.04 to 3.1)). By contrast very few postures were associated with regional pain, although bending forwards in an uncomfo rtable position for at least 15 minutes was associated with shoulder pain ( OR 1.6 (95% CI 1.2 to 2.2)) and kneeling for at least 15 minutes was associ ated with knee pain (OR 1.8 (95% CT 1.2 to 2.6)). Exposure to mechanical fa ctors was most strongly associated with pain at multiple sites rather than with pains in individual regions. Conclusions-Even among workers with only short term exposure to mechanical factors, musculoskeletal pain is increased.