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→Evaluation: +Osteoarthritis
* Measurement of the '''subacromial space'''. This is normally in shoulder radiographs is 9–10 mm; this space is significantly greater in men, with a slight reduction with age.<ref name=petersson1984/> In middle age, a subacromial space less than 6 mm is pathological.<ref name=petersson1984>{{cite journal|author=Claes J. Petersson & lnga Redlund- Johnell|pmid=6702430|title=The subacromial space in normal shoulder radiographs|journal=Acta Orthop Scanda |year=1984| volume=55 |issue=1 |pages=57–8}}</ref>
* Presence of any '''acromial spur'''
Also look for common differential diagnoses or worsening factors of shoulder impingement:
*Osteoarthritis. See severity grading at [[X-ray of osteoarthritis of the shoulder|X-ray of osteoarthritis of the shoulder]]
*Presence of any calcifications in the supraspinatus tendon, which indicates a differential diagnosis of calcific tendonitis.
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