Magnetic resonance imaging offers advantages over computer tomography for measurement of the shoulder stability ratio

IF 2.7 Q2 ORTHOPEDICS

Journal of Experimental Orthopaedics Pub Date : 2025-09-09 DOI:10.1002/jeo2.70423

Christian D. Schenk, Sebastian Oenning, Jens Wermers, Marcel Wilken, Julia Sußiek, Arne Riegel, Michael J. Raschke, J. Christoph Katthagen

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引用次数: 0

Abstract

Purpose

Recent studies indicate that bony shoulder stability ratio (BSSR) is a useful parameter for estimating glenohumeral stability provided by concavity-compression. In cases of bony glenoid defects, the BSSR may help to optimise surgical decision-making. However, the shapes of cartilage and labrum differ from the subchondral bony concavity. The aim of this study was to investigate the influence of cartilage and labrum on glenoid concavity and glenohumeral stability.

Methods

Ten cadaveric shoulders were examined by computer tomography (CT) and magnetic resonance imaging (MRI). Thereby radius, depth and stability ratio in anterior-posterior and superior-inferior directions were measured. MRI measurements were performed once including and once excluding the labrum. From these, BSSR, osteochondral shoulder stability ratio (OSSR) and fibrocartilaginous shoulder stability ratio (FCSSR) were calculated, and correlations were investigated to assess the transferability between imaging modalities.

Results

CT and MRI did not provide comparable results due to the influence of cartilage and labrum. The FCSSR showed a significantly higher stability ratio than BSSR in anterior-posterior and the same tendency in superior-inferior direction. OSSR and BSSR did not differ significantly. The labrum contributed to a significantly higher depth and lower radius in the anterior-posterior direction. Cartilage alone led to a significantly lower radius in both directions, without significant differences in depth. Comparison of CT and MRI measurements showed only weak correlations.

Conclusion

Labrum and cartilage lead to an increased depth and decreased radius, resulting in a higher glenoid concavity and, consequently, a higher stability ratio. Comparing FCSSR and BSSR, the influence of labrum and cartilage led to a 25% higher stability ratio in anterior-posterior direction and a 7.7% higher stability ratio in superior-inferior direction. By finding no significant differences between bony and osteochondral stability ratios, the labrum of the glenoid appears to be the major factor for the increase in stability ratio. Moreover, CT and MRI measurements showed no transferability.

Level of Evidence

Level II, diagnostic study.

Abstract Image

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磁共振成像在测量肩部稳定比方面比计算机断层扫描有优势

目的近年来的研究表明，骨肩稳定比（BSSR）是评估凹形压迫所提供的肩关节稳定性的一个有用参数。在骨盂缺损的情况下，BSSR可以帮助优化手术决策。然而，软骨和唇状突起的形状与软骨下骨凹不同。本研究的目的是探讨关节软骨和关节唇对关节盂凸度和关节盂肱骨稳定性的影响。方法采用计算机断层扫描（CT）和磁共振成像（MRI）对10具尸体肩部进行检查。测量前后方向、上下方向的桡骨、深度和稳定性比。MRI测量一次包括阴唇，一次排除阴唇。由此计算BSSR、骨软骨性肩关节稳定比（OSSR）和纤维软骨性肩关节稳定比（FCSSR），并研究其相关性以评估成像方式之间的可转移性。结果由于软骨和唇的影响，CT和MRI没有提供可比较的结果。FCSSR在前后方向上的稳定性比明显高于BSSR，在上下方向上的稳定性比明显高于BSSR。ssr和BSSR差异不显著。在前后方向上，唇状骨的深度明显增加，桡骨的半径明显减小。软骨单独导致桡骨在两个方向上明显较低，在深度上无明显差异。CT和MRI测量值的比较显示只有微弱的相关性。结论：关节唇和软骨导致关节深度增加，关节半径减小，关节盂凹度增大，关节稳定比增大。与BSSR和FCSSR相比，唇软骨的影响使前后方向稳定比提高了25%，上下方向稳定比提高了7.7%。通过发现骨性和骨软骨稳定性比之间没有显著差异，盂唇似乎是稳定性比增加的主要因素。此外，CT和MRI测量显示没有可转移性。证据等级II级，诊断性研究。

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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