HOW CUP POSITION AFFECTS DISLOCATION RATE IN PROXIMAL FEMORAL REPLACEMENT ARTHROPLASTY

Abstract: Purpose Revision as well as primary Arthroplasty with proximal femoral resection has increased a lot in recent time. The main concerning thing in PFRA is rate of dislocation in cases that is due to absent or weak abductor function, so cup position plays an important role in reducing dislocation rate in such cases. Methods This prospective study was conducted at department of orthopedic, Ghurki trust and teaching hospital, Lahore on those patients that had proximal femoral resection arthroplasty either as primary surgery or revision surgery, the cup position was measured postoperatively on x-ray and patient was followed for 12 weeks for any dislocation. Results Our study comprises of 42 patients with 71.4% were male and 28.6% were female. The mean inclination was 41.23°, ranging from 21° to 67°, and the mean ante version was 16.43°, ranging from 4° to 40°. The dislocation rate was 21.42% and the inclination in dislocated patients was 44.05±9.02 and ante version was 17.44±6.42. Conclusions Our study concludes that proper cup version and inclination plays a major role in preventing dislocation even in the absence of abductors in proximal femoral resection arthroplasty. Keywords Proximal femoral replacement, cup version, cup inclination, Hip arthroplasty