Journal of Bone and Joint Surgery - British Volume, Vol 86-B, Issue 2,
185-189.
doi: 10.1302/0301-620X.86B2.14338
Copyright © 2004 by British Editorial Society of Bone and Joint Surgery
Preservation of the bone mineral density of the femur after surface replacement of the hip
Y. Kishida, MD1;
N. Sugano, MD1;
T. Nishii, MD1;
H. Miki, MD1;
K. Yamaguchi, MD DMsC2; and
H. Yoshikawa, MD1
1 Department of Orthopaedic Surgery, Osaka University Medical School, 2-2 Yamadaoka, Suita 565-0871, Osaka, Japan.
2 Department of Orthopaedic Surgery, Kaizuka City Hospital, 3-10-20 Hori, Kaizuka, Osaka, Japan.
Correspondence should be sent to Dr Y. Kishida.
We investigated the effect of the Birmingham hip resurfacing (BHR) arthroplasty on the bone mineral density (BMD) of the femur. A comparative study was carried out on 26 hips in 25 patients. Group A consisted of 13 patients (13 hips) who had undergone resurfacing hip arthroplasty with the BHR system and group B of 12 patients (13 hips) who had had cementless total hip arthroplasty with a proximal circumferential plasma-spray titanium-coated anatomic Ti6A14V stem. Patients were matched for gender, state of disease and age at the time of surgery. The periprosthetic BMD of the femur was measured using dual-energy x-ray absorptiomentry of the Gruen zones at two years in patients in groups A and B.
The median values of the BMD in zones 1 and 7 were 99% and 111%, respectively. The post-operative loss of the BMD in the proximal femur was significantly greater in group B than in group A. These findings show that the BHR system preserves the bone stock of the proximal femur after surgery.
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