Hybrid total hip arthroplasty: a 7- to 11-year followup

A consecutive series of 125 hybrid total hip arthroplasties were performed in 120 patients by a single surgeon and were observed for an average of 8.6 years (range, 7-11 years). There were 38 men and 82 women with an average age of 71 years (range, 25-87 years) at the time of surgery. The diagnoses included primary and secondary osteoarthritis in 112 patients, osteonecrosis in 5 patients, and rheumatoid arthritis in 3 patients. All acetabular components were modular and had a Ti shell fixed with an average of 3 screws. The cemented femoral component was either Precoat or Precoat Plus with a 28-mm modular CoCr femoral head. The patients were prospectively observed clinically using the Harris hip score and radiographically using the Hip Society methods. Of the 125 total hip arthroplasties, 123 were followed for the entire observation period. The average preoperative Harris Hip Score was 37 (range, 15-55) and at the latest followup was 92 (range, 65-100). One acetabular component was revised for recurrent dislocations 3 years after surgery, and 1 stem was revised for mechanical loosening and 1 stem was radiographically loose. There was no evidence of cup migration of more than 1 mm. There were no radiolucencies around any of the screws. Two sockets had polyethylene wear of 2 mm. Localized pelvic osteolysis was noted in 5 hips (4%). The results of this study suggested that hybrid total hip replacement is an excellent procedure for reconstruction of the arthritic hip with minimal evidence of polyethylene wear and pelvic osteolysis.