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Three dimensional bone mineral density changes in the femur over 1 year in primary total hip arthroplasty patients.

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Authors
Gislason, Magnus Kjartan
Lupidio, Francesca
Jónsson, Halldór
Cristofolini, Luca
Esposito, Luca
Bifulco, Paolo
Fraldi, Massimiliano
Gargiulo, Paolo
Issue Date
2020-06-11

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Gislason MK, Lupidio F, Jónsson H Jr, et al. Three dimensional bone mineral density changes in the femur over 1 year in primary total hip arthroplasty patients. Clin Biomech (Bristol, Avon). 2020;78:105092. doi:10.1016/j.clinbiomech.2020.105092
Abstract
Background: The aim of the study was to compare the bone mineral density changes between unmatched patients undergoing total hip arthroplasty receiving uncemented and cemented type of implants. Previous studies have used DEXA or a two dimensional analysis to estimate the bone quality following total joint replacement, whereas this study presents the changes in three dimensions. Methods: Fifty subjects both male and females receiving both cemented and uncemented type of implant were recruited. Two CT scans were taken of each subject, the first at 24 h post surgery and the second one 1 year after surgery. The scans were calibrated using a phantom converting the Hounsfield units to bone mineral density values in g/cm3. The two scans were registered together using anatomical landmarks and resliced to compare the two femurs in the identical frame of reference. The bone density gain and loss was calculated by comparing density values between the two sets of scans. Findings: The results showed that most of the bone loss was located around the Lesser Trochanter and some bone density gain at the distal tip of the implant. The three dimensional density changes occur differently between individuals and the study showed no correlation of bone loss with age. Interpretation: The bone loss occurred mostly at the proximal femur, which is in agreement with previously presented studies. By carrying out three dimensional analysis on the bone gain and loss on the femur, it is possible to identify the patients that are showing high degree of bone loss. Keywords: Bone mineral density; Post-operative assessment; Total hip arthroplasty.
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https://www.sciencedirect.com/science/article/pii/S0720048X2030262X?via%3Dihub
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Copyright © 2020 Elsevier Ltd. All rights reserved.
ae974a485f413a2113503eed53cd6c53
10.1016/j.clinbiomech.2020.105092
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