Effect of head size, head material, and radiation dose on the repeatability of CT-RSA measurements of femoral head penetration

IF 3.3 2区医学 Q2 ENGINEERING, BIOMEDICAL

Journal of the Mechanical Behavior of Biomedical Materials Pub Date : 2025-01-22 DOI:10.1016/j.jmbbm.2025.106907

Jennifer S. Polus , Bart L. Kaptein , Brent A. Lanting , Matthew G. Teeter

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引用次数: 0

Abstract

Background

The risk of early revision of total hip arthroplasty (THA) for polyethylene wear is now low, but there remains a need to perform wear measurements in patients for clinical surveillance. The gold standard of wear measurements has been radiostereometric analysis (RSA), which has limited availability. The use of computed tomography (CT) to perform THA wear measurement was described a decade ago and found to have acceptable accuracy and precision, but high radiation dose was a concern. Additionally, the use of larger femoral head sizes and ceramic femoral heads has risen in the past decade. The objectives of the study were to determine the effect of femoral head size, femoral head material, and lowered radiation dose on femoral head penetration measurement repeatability.

Methods

A cadaveric hip was implanted with a cementless THA implant system. CT scans were acquired at a conventional radiation dose and at a reduced dose and repeated for a 32 mm and 36 mm cobalt-chromium femoral heads and a 32 mm ceramic femoral head. Apparent translation of the femoral head versus the acetabular cup was measured between the repeated scans using a CT-RSA software, where deviations from zero indicated measurement precision.

Results

The mean and standard deviation of translations in all planes was <0.200 mm. There was no effect for 3D translation of increasing cobalt-chromium head size (p = 0.2252). Cobalt-chromium heads had superior repeatability compared to ceramic heads at reduced dose (p = 0.022), but not at conventional dose (p = 0.1265). Further, superior repeatability was achieved with the reduced dose scan for the cobalt-chromium head (p = 0.0058), however there was no difference between doses for the ceramic head (p = 0.8148).

Discussion

CT-based wear measurement repeatability is excellent and consistent with prior literature even when implementing a larger femoral head, a ceramic femoral head, or reducing radiation dose to 25% of a conventional clinical scan.

查看原文本刊更多论文

头颅尺寸、头颅材料和辐射剂量对股骨头穿透CT-RSA测量可重复性的影响。

背景：聚乙烯磨损的全髋关节置换术（THA）早期翻修的风险现在很低，但仍然需要对患者进行磨损测量以进行临床监测。磨损测量的金标准是放射性立体分析（RSA），但其可用性有限。使用计算机断层扫描（CT）进行THA磨损测量是在十年前描述的，并且发现具有可接受的准确性和精度，但高辐射剂量是一个问题。此外，在过去十年中，更大股骨头尺寸和陶瓷股骨头的使用也有所增加。本研究的目的是确定股骨头尺寸、股骨头材料和降低辐射剂量对股骨头穿透测量重复性的影响。方法：采用无骨水泥全髋关节置换术植入尸体髋关节。在常规辐射剂量和降低剂量下进行CT扫描，并对32mm和36mm钴铬股骨头以及32mm陶瓷股骨头进行重复扫描。使用CT-RSA软件在重复扫描之间测量股骨头与髋臼杯的明显平移，其中偏差为零表示测量精度。讨论：基于ct的磨损测量的重复性非常好，与先前的文献一致，即使在实施更大的股骨头、陶瓷股骨头或将辐射剂量降低到常规临床扫描的25%时也是如此。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of the Mechanical Behavior of Biomedical Materials 工程技术-材料科学：生物材料

CiteScore

7.20

自引率

7.70%

发文量

505

审稿时长

46 days

期刊介绍： The Journal of the Mechanical Behavior of Biomedical Materials is concerned with the mechanical deformation, damage and failure under applied forces, of biological material (at the tissue, cellular and molecular levels) and of biomaterials, i.e. those materials which are designed to mimic or replace biological materials. The primary focus of the journal is the synthesis of materials science, biology, and medical and dental science. Reports of fundamental scientific investigations are welcome, as are articles concerned with the practical application of materials in medical devices. Both experimental and theoretical work is of interest; theoretical papers will normally include comparison of predictions with experimental data, though we recognize that this may not always be appropriate. The journal also publishes technical notes concerned with emerging experimental or theoretical techniques, letters to the editor and, by invitation, review articles and papers describing existing techniques for the benefit of an interdisciplinary readership.