0215 Acromioclavicular joint degeneration in relation to cumulative occupational mechanical exposures: a magnetic resonance imaging study
本研究通过磁共振成像评估了136名男性工人（机械师、汽车修理工、油漆工）的肩锁关节退变，发现高强度用力工作与退变风险增加相关（OR=4.0），而手臂抬高和重复性工作无显著关联。
<h3>Objectives</h3> Little is known about the influence of occupational mechanical shoulder exposures on the development of acromioclavicular joint degeneration. We aimed to evaluate if arm elevation >90<sup>o</sup>, force requirements, and repetitive work are associated with acromioclavicular joint degeneration as assessed by magnetic resonance imaging (MRI). <h3>Method</h3> The study population participated in a study in 2000–2001, where we performed MRI examinations of the right shoulder of 136 right-handed, 40–50 year old men from a historical cohort of machinists, car mechanics, and house painters. In 2011–2012, we re-examined these men. Two radiologists evaluated the images, blinded to exposures status and symptoms. Acromioclavicular joint degeneration was registered in case of subchondral irregularities, joint capsule swelling with adjacent bone marrow oedema and/or subacromial spurs. Cumulative exposures since baseline were obtained by combining self-reported work histories with a job exposure matrix based on expert judgement. We applied multivariable logistic regression adjusted for measured BMI, questionnaire information on smoking, and age. <h3>Results</h3> Of the original population, 129 could be invited, and 90 (70%) participated. Their mean age was 55.1 years (SD 2.8, range 50–60). The prevalence of acromioclavicular joint degeneration was 64% against 43% at baseline. Prevalent MRI findings showed a relation to forceful work: OR 4.0 (95% CI 1.3–12.1). Incident MRI findings were also related to forceful work, without reaching significance. Arm elevation and repetitive work were not associated with the outcome. <h3>Conclusions</h3> Forceful work seems to be a risk factor for acromioclavicular joint degeneration as assessed by MRI at 50–60 years of age.