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KMID : 0386720020140020121
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Journal of the Korean Hip Society
2002 Volume.14 No. 2 p.121 ~ p.127
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Quantitative Analysis of Bone Mineral Density in Proximal Femur following Cementless Total Hip Arthroplasty
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Kang Joon-Soon
Park Seung-Rim
Kim Hyoung-Soo
Yeoum Seung-Hoon
Lee Tong-Joo
Kim Shin
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Abstract
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Purpose: The purpose of this study was to evaluate the factors influencing the change of bone mineral density (BMD) around the femoral stem after cementless total hip arthroplasty.
Materials and Methods: We studied 35 patients who had ipsilateral total hip replacement arthroplasty using Anatonic medullary locking (AML) stem. BMD within both proximal parts of the femur was evaluated based on Gruen zones using DEXA at 1 and 2 years after surgery. Percent decreases in total BMD were correlated with duration of implant and implant diameter.
Results: Average BMD of the implanted side was 1.082ｇ/㎠ and that of the control side was 1.275ｇ/㎠. There was an average 24.3% decrease of BMD in zone 1 and 32.7% in zone 7. At 1 and 2 years after surgery, the mean loss of BMD in the implanted side was14.6 and 15.5%, respectively, and there was no significant difference in the change of BMD for the duration of follow-up. The group of large size stem (greater than 15㎜ in diameter) showed a signigicantly higher bone loss in zone 7 than the group of small size stem (45.5% vs. 20.4%, P=0.047).
Conclusion: There was signigicant bone loss in zone 7 and the implant size affected the rate of periprosthetic bone remodelling.
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KEYWORD
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Cementless total hip arthroplasty, AML, bone density, DEXA
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