Joint Diseases and Related Surgery (JDRS), the official journal of the Turkish Joint Diseases Foundation, is an international, peer-reviewed, immediate open access journal. All published articles in JDRS has been free for everyone, without embargo, since 1990.

Purpose: To determine the prevalence of acromion type, os acromiale, and the relation of acromion typology with subacromial distance in a Turkish population.Materials and Methods: A total of 528 patients who met the inclusion criteria were evaluated in terms of presence of os acromiale, type of acromion, and subacromial distance by two radiologists. Acromion typology was evaluated in patients without os acromiale. Variations of subacromial distance depending on the presence of os acromion, sex, affected side (right / left) were statistically assessed. In addition, an association between subacromial distance and acromion types was sought.Results: Twelve patients (2.27%) had os acromiale. One-hundred and sixteen patients had type I acromion (22.5%) whereas 352 had type II acromion (68.2%), 10 had type III acromion (1.9%), and 38 had type IV acromion (7.4%). The median subacromial distance was found to be 6.6 mm (95% CI for median; 6.5-6.77 mm). Regarding the acromion type, subacromial distance was significantly higher in type IV acromion than in types I and II (p= 0.02). There was no significant difference in subacromial distance according to sex and side (p=0.309 and 0.454 respectively). Conclusion: There was no significant difference in subacromial distance according to sex and side in the Turkish population. The most and least common types of acromion in the evaluated Turkish population were type II and type III, respectively. The subacromial distance was greater in type 4 acromion.