Abstract

Objective: To examine hip development in a patient who underwent Dega osteotomy due to developmental dysplasia of the hip (DDH) by means of radiography.
Materials and Methods: Dega osteotomy was performed on 43 hips (7 were bilateral) of 36 patients with DDH. In preoperative and final follow-up; the acetabular index (AI), acetabular depth ratio (ADR) and Wiberg's center-edge angle (CEA) were measured in anteroposterior pelvic radiographs. Hips were classified in accordance with Tönnis classification system. Radiological findings were evaluated in accordance with Severin classification system. Avascular necrosis (AVN) of the hips were evaluated according to Kalamchi-MacEwen classification system.
Results: The mean age was 87 months (48-130 months), mean follow-up period was 30.5 months (15-62 months). The mean preoperative and final follow-up values of AI were 43° (28°to 60°) and 19° (6° to 34°), respectively. The mean preoperative and final follow-up values of ADR were detected as 14 (8 to 24) and 26 (18 to 42), respectively.The mean CEA was found as 38° (18° to 61°) at the final follow-up. Of the hips, 37 were Tönnis type 4 and 6 were Type 3. Totally 10 hips had AVN; of those, 6 were Type 1, 2 were Type 2 and 2 were Type 3 hips. According to Severin classification, 11 hips were Type 1a, 3 were Type 1b, 22 were Type 2a, 5 were Type 2b and 2 were Type 3.
Conclusion: In patients who underwent Dega osteotomy, hip development can be detected radiographically with satisfactory levels.

Key words: Hip; Dysplasia; Osteotomy.