Radiographic Joint Space in Normal Acromioclavicular Joints

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Abstract
The acromioclavicular joint space in standard antero-posterior images of 151 normal subjects was measured. the joint space was significantly wider in men. There was a highly significant reduction of the joint space with age in both men and women and in persons past 60 a joint space of 0.5 mm or less is not pathological. A joint space wider than 7 mm in men and 6 mm in women is abnormal. the measuring technique described is useful in population studies. in individual cases a simple measurement with a ruler serves the same purpose.

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