Modified Colonna Capsular Arthroplasty Procedure to Treat Neglected Developmental Dysplasia of the Hip

The management of neglected developmental dysplasia of the hip (DDH) in adolescents and young adults presents a significant challenge. This study aimed to assess the clinical and radiological outcomes of the modified Colonna capsular arthroplasty technique in patients with neglected DDH.

This retrospective cohort study included four patients (aged 13-24 years) with unilateral neglected DDH who underwent the modified Colonna capsular arthroplasty procеdurе between 2012 and 2021. Preoperative and postoperative radiographic parameters were assessed, such as lateral center-edge angle (LCEA), acetabular index (AI), joint space width, and medial head border-ilioischial line distance. Clinical outcomes were evaluated using the Harris Hip Score (HHS), Postel-Merle d'Aubigné (PMA) score, and range of motion (ROM).

The mean follow-up duration was 40.75 months (12-90 months). Postoperatively, the mean LCEA was 36° (range: 29-45°), and the mean AI was -0.5° (range: -6 to 4°). The joint space width was 2.5 mm (range: 1-4 mm), and the medial head border-ilioischial line distance was 4.5 mm (range: 3-8 mm). The mean postoperative PMA score was 17 (range: 16-18), and the mean HHS was 96.5 (range: 93-100). All patients achieved normal hip ROM, with no reported cases of avascular necrosis or femoral neck fractures. One patient developed class II heterotopic ossification; however, no further intervention was required.

Modified Colonna capsular arthroplasty seems to be a reliable and efficient treatment for neglected DDH in young patients, providing satisfactory joint preservation, improved function, and minimal complications.