Abstract

Objectives The aim of this study was to compare measurements of angle of lateral opening (ALO) and version determined using a radioopaque cup position assessment device imaged with fluoroscopy to measurements obtained by CT and direct measurement in a cadaveric model. Our null hypothesis was that there would not be any difference in the angles measured by the techniques.

Methods Six cadavers were implanted with BFX acetabular components. The CPAD was placed and images were obtained with fluoroscopy. Measurements were obtained from the radiopaque marker bars on the CPAD device, and version and ALO were calculated. The ALO and version were determined by CT and DM. Comparisons were made using a two-way analysis of variance and a generalized linear model procedure analysis.

Results There were no significant differences between the measurements for ALO (p = 0.275) or version (p = 0.226). Correlation between methods was 0.948 and 0.951 for ALO and version, respectively. The mean difference (standard deviation [SD], and 95% confidence interval [CI]) for ALO were: CT versus CPAD 1.85 degrees (± 2.32 degrees [-2.99–3.31]), CT versus DM 1.96 degrees (± 1.99 degrees [−2.2–4.27]), CPAD versus DM1.74 degrees (±2.21 degrees [−1.13 and 5.24]). The mean difference (SD [CI]) for version was CT versus CPAD 2.86 degrees (±1.56 degrees [ −2.63–1.69]), CT versus DM 1.10 degrees (±1.42 degrees [−1.57–2.09]), CPAD versus DM 1.07 degrees (±0.76 degrees [0.13–2.09]).

Clinical Relevance The results demonstrate that intraoperative imaging in cadaveric specimens with the CPAD is an accurate method to determine ALO and version of the acetabular component.

Author Contributions

R. Lirtzman contributed to the concept and design of the Cup Positioning Assessment Device. All authors contributed to the study design. B Dalbeth, W. M. Karlin and R. Lirtzman contributed to the data acquisition. B Dalbeth, W. M. Karlin and M. Kowaleski contributed to analysis and interpretation of data. All authors drafted and revised the manuscript and approved submission.

中文翻译：

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狗全髋关节置换术中髋臼组件位置的测量：使用透视法结合CT评估和直接测量的不透射线杯形位置评估设备的比较。

摘要

目的 这项研究的目的是比较用荧光透视成像的不透射线杯位置评估装置测定的侧向张开角（ALO）和版本的测量结果与通过CT进行的测量结果以及在尸体模型中的直接测量结果。我们的零假设是，使用该技术测量的角度不会有任何差异。

方法 6具尸体植入BFX髋臼假体。放置CPAD，并通过荧光检查获得图像。从CPAD设备上的不透射线标记条获得测量值，并计算版本和ALO。ALO和版本由CT和DM确定。使用方差的双向分析和广义线性模型过程分析进行比较。

结果 ALO（p  = 0.275）或版本（p  = 0.226）的测量值之间无显着差异。ALO和版本的方法之间的相关性分别为0.948和0.951。ALO的平均差异（标准差[SD]和95％置信区间[CI]）为：CT与CPAD 1.85度（±2.32度[-2.99–3.31]），CT与DM 1.96度（±1.99度[ -2.2–4.27]，CPAD与DM1.74度（±2.21度[-1.13和5.24]）。版本的平均差异（SD [CI]）为CT与CPAD 2.86度（±1.56度[-2.63-1.69]），CT与DM 1.10度（±1.42度[−1.57–2.09]），CPAD与DM 1.07度（±0.76度[0.13-2.09]）。

临床相关性 结果表明，使用CPAD对尸体标本进行术中成像是确定ALO和髋臼组件版本的准确方法。

作者贡献

R. Lirtzman为杯定位评估设备的概念和设计做出了贡献。所有作者都为研究设计做出了贡献。B Dalbeth，WM Karlin和R. Lirtzman为数据采集做出了贡献。B Dalbeth，WM Karlin和M. Kowaleski对数据的分析和解释做出了贡献。所有作者都起草并修改了手稿并批准了投稿。