The influence of tibial length on radiographic posterior tibial slope measurement: How much tibia do we need?

IF 1.6 4区医学 Q3 ORTHOPEDICS

Knee Pub Date : 2024-07-08 DOI:10.1016/j.knee.2024.06.005

Sharif Garra, Zachary I. Li, Jairo Triana, Ian Savage-Elliott, Michael R. Moore, Ajay Kanakamedala, Kirk Campbell, Michael Alaia, Eric J. Strauss, Laith M. Jazrawi

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引用次数: 0

Abstract

Purpose

The purpose of this study was to determine whether significant differences exist when comparing posterior tibial slope (PTS) measured using increasing lengths of the tibia to determine the anatomical axis.

Methods

Patients with full-length weight-bearing tibial radiographs were retrospectively identified from 2014 to 2022 at a single institution. Patients were excluded if there was any previous history of lower extremity fracture or osteotomy. The anatomical axis of the tibia was determined using the full length of tibial radiographs, and the “reference PTS” was measured using this axis. Using the same radiograph, the PTS was measured using four different anatomical axes at standardized tibial lengths. While the center of the proximal circle remained constant at 5-cm below the tibial plateau, the center of the distal circle was drawn at four points: a) overlapping circles; b) 10-cm distal to the tibial plateau; c) 15-cm distal to the tibial plateau; d) half the length of the tibia, measured from the tibial plateau to the tibial plafond. Bivariate correlation and frequency distribution analysis (measurements >2-degrees from reference PTS) were performed between the reference PTS and PTS measured at each of the four other lengths.

Results

A total of 154 patients (39.8 ± 17.4 years old, 44.2% male) were included in the final analysis. Measurements at each of the four tibial lengths were all significantly different from the reference PTS (p < 0.001). The correlation strength improved with increasing tibial length (overlapping: R = 0.681, 10-cm: R = 0.821, 15-cm: R = 0.937, and half-tibia: R = 0.963). The number of PTS measurements >2-degree absolute difference from the reference PTS decreased with increasing tibial length (overlapping: 40.3%, 10-cm: 24.0%, 15-cm: 26.0%, and half-tibia: 18.8%).

Conclusion

Assessment of PTS is dependent on the length of the tibia utilized to obtain the anatomical axis. Accuracy and precision of PTS measurements improved with increasing length of tibia used to determine the anatomical axis.

Study design

Case series.

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胫骨长度对影像学胫骨后斜度测量的影响：我们需要多少胫骨？

目的：本研究旨在确定在比较胫骨后斜度（PTS）时是否存在显著差异，胫骨后斜度是通过增加胫骨长度来确定解剖轴线的：方法：对一家医疗机构2014年至2022年期间获得全长负重胫骨X光片的患者进行回顾性鉴定。既往有下肢骨折或截骨病史的患者排除在外。使用胫骨全长X光片确定胫骨的解剖轴线，并使用该轴线测量 "参考PTS"。使用同一张 X 光片，在标准化胫骨长度上使用四个不同的解剖轴测量 PTS。近端圆心保持在胫骨平台下 5 厘米处，而远端圆心则画在四个点上：a）重叠圆；b）胫骨平台远端 10 厘米处；c）胫骨平台远端 15 厘米处；d）胫骨长度的一半，从胫骨平台测量到胫骨骺板。对参考 PTS 和在其他四个长度上测量的 PTS 进行双变量相关性和频率分布分析（测量值与参考 PTS 相差大于 2 度）：共有 154 名患者（39.8 ± 17.4 岁，44.2% 为男性）被纳入最终分析。四种胫骨长度下的测量结果均与参考 PTS 存在显著差异（P 与参考 PTS 的 2 度绝对差异随胫骨长度的增加而减小（重叠：40.3%；10 厘米：24.0%；15 厘米：26.0%；半胫骨：18.8%）：结论：PTS的评估取决于用于获得解剖轴线的胫骨长度。研究设计：研究设计：病例系列。

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

Knee 医学-外科

CiteScore

3.80

自引率

5.30%

发文量

171

审稿时长

6 months

期刊介绍： The Knee is an international journal publishing studies on the clinical treatment and fundamental biomechanical characteristics of this joint. The aim of the journal is to provide a vehicle relevant to surgeons, biomedical engineers, imaging specialists, materials scientists, rehabilitation personnel and all those with an interest in the knee. The topics covered include, but are not limited to: • Anatomy, physiology, morphology and biochemistry; • Biomechanical studies; • Advances in the development of prosthetic, orthotic and augmentation devices; • Imaging and diagnostic techniques; • Pathology; • Trauma; • Surgery; • Rehabilitation.