Abstract
Introduction
Dysplastic hip has not only deficiency of acetabulum but also femoral deformity. Therefore, selection of stem is important in cementless THA for dysplasia. Especially using of short stem should be challenge for deformed femur. We studied clinical performance and radiological findings after THA with triple tapered short stem (Optimys hip) for dysplastic hip.
Materials and method
From May 2013, we performed cementless THA for osteoarthritis with dysplasia. Seventy-one hips of 67 patients were examined including four males and 63 females. Age at surgery was from 36 to 88 years old (61.7 in average). Surgical approach was used modified Watson-Jones in all hips. Clinical evaluation was used modified Harris hip score (MHSS), incidence of complications and thig pain. Radiological findings were evaluated according Engh's classification and grade of stress shielding. Follow-up period was minimum one year and was 21.3 months in average.
Results
MHHS before surgery was 41 points and that at follow-up was 88 points in average and pain score was significantly improved. Calcar fracture during surgery occurred in two hips and circular wiring was performed. Deep infection, DVT and dislocation were not observed. Incidence of thigh pain was 1.4% of one hip. Radiological findings were assessed as bone in-grown in all of the hips and grade of stress-shielding was very low. There were no aseptic loosening and no revision for any reasons.
Conclusions
Cementless THA with triple tapered short stem was useful for treatment of dysplastic hips. Radiological findings of all hip were assessed as bone in-grown.
