Aim: This study aimed to investigate the distribution of modified Walch classification groups in a Turkish patient population. We think that there may be glenoid morphologies that do not fit the modified Walch classification due to ethnic differences. Methods: Computed tomography images of 113 patients with primary glenohumeral osteoarthritis (GHOA) were evaluated. Version angle was measured according to the Friedman method, and classification was made by two blinded surgeons according to the modified Walch classification. Patients who did not meet the modified Walch groups were labeled as “Unclassifiable” and were analyzed as the 8th group. Results: The mean age of the patients was 85.5 ± 7.5 years. Forty-eight patients were male (42.5%). Eighty-two patients (72.6%) belonged to Walch group A (60 A1 and 22 A2, respectively). The total percentage of group B was 16.7% (20 patients). Two patients were included in the “Unclassifiable” group. One of the patients had glenoid convexity due to advanced disease with 1° anteversion. The other patient in this group had anterior subluxation without underlying pathology. Conclusion: The distribution of modified Walch groups in the Turkish population may be different from other populations. Posterior defective glenoid and excessive retroversion may concern less in the Turkish population with primary GHOA. Our results were obtained limited population and we think that further epidemiologic studies with larger sample size are needed.