2003•PubMedRequires access
Sequential changes in periprosthetic bone mineral density following total hip arthroplasty: a 3-year follow-up.
Hiroshi Ohta, Seneki Kobayashi, Naoto Saito, Masashi Nawata, Hiroshi Horiuchi, Kunio Takaoka
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Abstract
We sequentially measured the periprosthetic bone mineral density (BMD) of the femur after cementless total hip arthroplasty, using dual-energy X-ray absorptiometry, over a 3-year period. The periprosthetic bone was divided into three regions (proximo-medial, middle, and distal to the prosthetic stem). After the insertion of a fully porous coated stem in 21 patients, the BMD was measured within 3 weeks, and 6, 12, 24, and 36 months after surgery. At 6 months, all zones showed a decrease in BMD relative to the BMD within 3 weeks, but subsequently the BMD was unchanged. The lower the BMD within 3 weeks of surgery, or the lower the body weight, the higher the percent loss of BMD at 6 months.