The Journal of Bone and Joint Surgery 79:682-89 (1997)
© 1997 The Journal of Bone and Joint Surgery, Inc.
Measurement of Polyethylene Wear in Acetabular Components Inserted with and without Cement. A Randomized Trial*
PETER A. DEVANE, M.B., CH.B. ,
ERIC J. ROBINSON, M.D. ,
ROBERT B. BOURNE, M.D.,
CECIL H. RORABECK, M.D.,
NARESH N. NAYAK, M.D. and
J. GEOFFREY HORNE, M.B., CH.B., LONDON, ONTARIO, CANADA
Investigation performed at the Department of Orthopaedic Surgery, University Hospital, London
We measured the three-dimensional wear of polyethylene after total hip arthroplasty with a titanium metal-backed Mallory-Head prosthesis that was inserted with cement in sixty-nine patients (sixty-nine hips) and with a press-fit titanium metal-backed Mallory-Head prosthesis that was inserted without cement in seventy patients (seventy hips). A modular titanium femoral head was used in all of the hips. The patients in the present study were part of a larger double-blind randomized trial comparing the result of total hip arthroplasty performed with cement with that of the same procedure performed without cement in 250 patients. The criterion for inclusion in the study of polyethylene wear was a minimum duration of follow-up of four years, which was met by 148 patients. As adequate radiographs for digitization were not available for nine patients, 139 patients were included in the present study. The age of the patient, the postoperative Harris hip score, the diameter of the femoral head, the thickness of the liner in the polar region of the acetabular component, and the duration of follow-up were similar for the two groups. The mean rate of volumetric wear of the polyethylene was significantly greater in the prostheses that had been inserted without cement than in those that had been inserted with cement (155.1 cubic millimeters per year compared with 98.5 cubic millimeters per year; p = 0.000008). Thirty-four (49 per cent) of the seventy hips in which the prosthesis had been inserted without cement had evidence of osteolysis on radiographs, compared with twelve (17 per cent) of the sixty-nine hips in the other group (p = 0.0002). Osteolysis was associated with an increased rate of polyethylene wear only in the hips in which the prosthesis had been inserted without cement.
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