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Journal of Bone and Joint Surgery - British Volume, Vol 87-B, Issue 11, 1475-1479.
doi: 10.1302/0301-620X.87B11.16101  
Copyright © 2005 by British Editorial Society of Bone and Joint Surgery
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Mid-term wear characteristics of an uncemented acetabular component

J. H. M. Goosen, MD, Resident Orthopaedic Surgery1; C. C. P. M. Verheyen, MD, PhD, Orthopaedic Surgeon1; and N. J. A. Tulp, MD, PhD, Orthopaedic Surgeon1

1 Department of Orthopaedic Surgery, Isala Clinics, Weezenlanden Hospital, 8011 JW Zwolle, The Netherlands.

Correspondence should be sent to Dr N. J. A. Tulp; e-mail: n.j.a.tulp{at}isala.nl

We investigated the rate of polyethylene wear of a cementless acetabular component at different periods of follow-up in order to test the hypothesis than an irrecoverable deformation process (creep) was followed by an initially low, but gradually increasing wear rate. We studied prospectively 93 uncemented total hip arthroplasties in 83 patients (mean age 50 years (22 to 63)) with a mean follow-up of 8.2 years (3 to 12). We measured the penetration of the femoral head from radiographs taken immediately after surgery at three, six and nine years, or at the latest follow-up.

The median wear rate was 0.17 mm per year in the first three years, a finding which we considered to be caused by creep. Thereafter, the rate of wear declined to 0.07 mm per year (four- to six-year period) and then increased to 0.17 mm per year (seven to nine years) and 0.27 mm per year (more than nine years), which we considered to be a reflection of genuine polyethylene wear. After the nine-year follow-up the wear rates were higher in patients with marked osteolysis. We found no relationship between the inclination angle of the acetabular component or femoral head orientation and the rate of wear. No acetabular component required revision.






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Hip, Knee, Trauma, Upper limb, Foot & Ankle, Paediatrics, Oncology, Spine, Arthroplasty, General