Charnley Ogee-flanged cup in primary total hip arthroplasty for acetabular dysplasia

ABSTRACT

Ogee-flanged socket was introduced by Sir John Charnley for use in low-friction hip arthroplasty. The results of 18 primary total hip arthroplasties performed in 17 patients with moderate congenital acetabular dysplasia were reviewed. Charnley total hip prosthesis including a non-modular femoral stem and an ogee-flanged acetabular socket were used in all patients. The average duration of follow up after arthroplasty was 5.3 years [range 4-7 years]. All patients were evaluated using a modified Harris hip scoring system and a standardized anteroposterior pelvis radiograph for hips. Differences between the preoperative and postoperative [last evaluation] scores were assessed with the student's t-test and Chi-square test. The mean overall modified Harris hip score was improved from 48 points preoperatively to 89 points at the last follow up evaluation, this improvement was significant. A low percentage of radiological demarcation at the bone-cement interface around the acetabular sockets was observed in the immediate postoperative and the last follow up radiographs