Sequential changes in periprosthetic bone mineral density following total hip arthroplasty: a 3-year follow-up.
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.
Ohta
Hiroshi
H
Department of Orthopaedic Surgery, Shinshu University, School of Medicine, 3-1-1 Asahi, Matsumoto 390-8621, Japan.
Kobayashi
Seneki
S
Saito
Naoto
N
Nawata
Masashi
M
Horiuchi
Hiroshi
H
Takaoka
Kunio
K
D015502:Absorptiometry, Photon; D000328:Adult; D000368:Aged; D019644:Arthroplasty, Replacement, Hip / Q000009:adverse effects*; D001835:Body Weight; D015519:Bone Density; D005260:Female; D005269:Femur / Q000033:anatomy & histology / Q000502:physiology*; D005500:Follow-Up Studies; D006622:Hip Prosthesis; D006801:Humans; D008875:Middle Aged; D013997:Time Factors