Abstract
Fifty-seven primary cementless total hip arthroplasties (THAs) were performed in 48 patients with rheumatoid arthritis. The average length of follow-up was 2.4 years (range; 1.1 to 4.4 years).The average age of these 48 patients at the time of surgery was 56.9 years (range; 36 to 78 years). In all patients Kyocera Per Fix HA prosthesis was used.Clinical evaluation based on the JOA score indicated significant improvement from 36.8 points preoperatively to 67.4 points postoperatively. Three patients (5%) complained of thigh pain. There was no evidence of roentgenographic failure such as femoral component subsidence, loosening or osteolysis. Spot welds contacting the porous surfaces were observed in 52 hips (91%). None of the hips showed radiolucent lines adjacent to the porous-surfaced portion of the stems. All femoral components showed bone ingrown fixation. These findings suggest that cementless stem may be successful in rheumatoid patients.
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