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Results of the Anatomic Medullary Locking Total Hip Arthroplasty at a Minimum of Twenty Years

A Concise Follow-up of Previous Reports*

Belmont, Philip J. Jr., MD1; Powers, Cara C., MD2; Beykirch, Sarah E., BS2; Hopper, Robert H. Jr., PhD2; Engh, C. Anderson Jr., MD2; Engh, Charles A., MD2

doi: 10.2106/JBJS.G.01142
Scientific Articles

Abstract: Between October 1982 and December 1984, the senior author performed 223 total hip arthroplasties in 215 patients with use of the anatomic medullary locking hip stem and TriSpike cup. We now report on 119 of these hips at a mean of 22.0 years (range, 20.0 to 25.0 years) after surgery. Of the fifty-six hips with minimum twenty-year follow-up radiographs and the original acetabular component, seventeen (30.4%) had pelvic osteolytic lesions measuring larger than 1.5 cm2. Of the sixty-eight hips with twenty-year radiographs and the original anatomic medullary locking stem, twenty-five (36.8%) had femoral osteolytic lesions measuring larger than 1.5 cm2. Acetabular osteolysis was significantly associated with cup loosening (p = 0.006), but the presence of femoral osteolysis was not associated with stem loosening. Kaplan-Meier analysis, with revision for any reason as the end point, revealed that the survival rate at twenty years was 85.8% ± 5.2% for the acetabular shell and 97.8% ± 2.2% for the stem. The most common reoperation was polyethylene exchange because of wear or osteolysis.

Level of Evidence: Therapeutic Level IV. See Instructions to Authors for a complete description of levels of evidence.

1Orthopaedic Surgery and Rehabilitation Service, William Beaumont Army Medical Center, 5005 North Piedras Street, El Paso, TX 79920-5001

2Anderson Orthopaedic Research Institute, P.O. Box 7088, Alexandria, VA 22307. E-mail address for C.C. Powers:

Copyright © 2008 by The Journal of Bone and Joint Surgery, Incorporated
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