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首页> 外文期刊>Journal of Biomechanics >Correlation of radiographic and telemetric data from massive implant fixations
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Correlation of radiographic and telemetric data from massive implant fixations

机译：大量植入物固定的射线照相和遥测数据的相关性

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One proximal femoral replacement (PFR) and two distal femoral replacements (DFR) used in tumoural limb salvage were instrumented to measure axial force in the femoral shaft and at the tip of the intramedullary stem in vivo. The prostheses were implanted in suitable subjects and regular recording sessions held over 2 years for each subject. The ratio of the tip force to the shaft force increased with time in all 3 subjects, albeit at different rates, indicating that a greater proportion of the load was being transmitted along the prosthesis stem. The aim of this study was to correlate these changes with bone remodelling observed radiographically over the same period. Radiographs were analysed using a computer-assisted method to quantify bone width, radiolucent line width and relative bone density. The analysis showed the development of radiolucent lines at the bone-cement interface and a decrease in the lateral to medial ratio of bone density near the transection site. For the PFR, the mean width of the radiolucent area alongside the proximal fifth of the stem on the lateral side increased from 0 to 0.67 mm over the 2 years. The tip to shaft ratio correlated significantly with radiolucency on the lateral side of the stem. Both the DFRs became loose within 2 years but the PFR has remained in situ for 13 years to date. The correlations found thus far suggest that it may be possible to establish relationships between load transfer (and therefore loosening in the fixation) and radiographic data, with possible application to advance warning of clinical loosening in stemmed implants. (c) 2005 Published by Elsevier Ltd.
机译：使用一种在肿瘤肢体抢救中使用的股骨近端置换术（PFR）和两个股骨远端置换术（DFR）来测量体内股骨干和髓内茎尖端的轴向力。将假体植入合适的受试者中，并对每个受试者进行为期2年以上的定期录音。在所有三个对象中，尖端力与轴力的比率均随时间增加，尽管速率不同，这表明较大比例的载荷沿假体杆传递。这项研究的目的是将这些变化与同期在放射学上观察到的骨骼重塑相关联。使用计算机辅助方法分析X射线照片以量化骨宽度，射线可透线宽和相对骨密度。分析表明，在骨水泥界面处出现了射线可透线，并且在横切部位附近骨密度的外侧与内侧之比降低。对于PFR，在过去2年中，与侧面外侧茎近端五分之一位置相邻的射线可透区域的平均宽度从0增加到0.67 mm。头顶与轴的比例与茎侧面的透照度显着相关。两种DFR都在2年内变得松散，但迄今为止，PFR仍在原地保留了13年。迄今发现的相关性表明，有可能在载荷转移（因此在固定中松动）和射线照相数据之间建立关系，并有可能用于提前警告茎状植入物临床松动。 （c）2005年由Elsevier Ltd.发布。

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