Clinical and radiographic outcomes of total hip arthroplasty with insertion of an anatomically designed femoral component without cement for the treatment of primary osteoarthritis - A study with a minimum of six years of follow-up

We evaluated the clinical and radiographic outcomes of 100 consecutive prim ary total hip arthroplasties in which a proximally coated anatomically desi gned femoral component was fixed without cement for the treatment of primar y osteoarthritis. The minimum duration of follow-up was six years (average, 7.1 years). The eighty-eight patients who had the arthroplasties were foll owed prospectively with a standard clinical evaluation that involved use of the Harris hip score and a radiographic evaluation based on the criteria o f the Hip Society. Bone ingrowth was evaluated with the method of Engh et a l. The average age of the patients at the time of the operation was 62.6 years (range, thirty-nine to eighty-four years). Fifty-one patients were men and thirty-seven were women. The average preoperative Harris hip score was 48 points,,vith an average pain score of 15 points and an average function sco re of 26 points. Nonmechanical complications that necessitated a revision o peration included one deep hematogenous infection, one late periprosthetic fracture, and a 0.5-inch (1.27-centimeter) limb-length discrepancy. At the time of the most recent follow-up, the average Harris hip score was 96 poin ts, with an average pain score of 42 points and an average function score o f 45 points, The prevalence of pain in the anterior part of the thigh was 5 percent (five hips). One patient had a revision of the femoral component b ecause of aseptic loosening, and one had a revision of the acetabular compo nent because of recurrent dislocations. Radiographic assessment revealed consistent evidence of proximal bone ingro wth. No complete radiolucent line was identified, except around the stem th at had loosened. Twenty-seven femoral components were associated with sligh t pedestal formation. No osteolytic lesion of the femur was identified. Non progressive pelvic osteolysis was identified in four hips, but none of the lesions were more than two millimeters in diameter. None of the acetabular components migrated, and no radiolucent line of more than two millimeters i n thickness was seen around any acetabular cup. The data from this study, in which the minimum duration of follow-up was si x years, indicate that the anatomically designed prosthesis can provide goo d results, with low prevalences of pain in the thigh and loosening of the c omponent, in younger, active patients.