Schenk Christian D, Oenning Sebastian, Wermers Jens, Wilken Marcel, Sußiek Julia, Riegel Arne, Raschke Michael J, Christoph Katthagen J
Department for Trauma-, Hand- and Reconstructive Surgery University Hospital Münster Münster Germany.
Department of Engineering Physics University of Applied Sciences Münster Germany.
J Exp Orthop. 2025 Sep 9;12(3):e70423. doi: 10.1002/jeo2.70423. eCollection 2025 Jul.
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.
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.
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.
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 II, diagnostic study.
近期研究表明，骨性肩关节稳定率（BSSR）是评估由凹面压缩提供的盂肱关节稳定性的有用参数。在存在骨性肩胛盂缺损的情况下，BSSR可能有助于优化手术决策。然而，软骨和盂唇的形状与软骨下骨凹面不同。本研究的目的是探讨软骨和盂唇对肩胛盂凹面及盂肱关节稳定性的影响。
对10具尸体肩关节进行计算机断层扫描（CT）和磁共振成像（MRI）检查。测量前后方向和上下方向的半径、深度及稳定率。MRI测量分别在包括盂唇和排除盂唇的情况下各进行一次。据此计算BSSR、骨软骨性肩关节稳定率（OSSR）和纤维软骨性肩关节稳定率（FCSSR），并研究相关性以评估成像方式之间的可转移性。
由于软骨和盂唇的影响，CT和MRI结果不具有可比性。FCSSR在前后方向上的稳定率显著高于BSSR，在上下方向上有相同趋势。OSSR和BSSR无显著差异。盂唇在前后方向上导致深度显著增加而半径减小。单独的软骨在两个方向上均导致半径显著减小，深度无显著差异。CT和MRI测量结果的比较仅显示出弱相关性。
盂唇和软骨导致深度增加和半径减小，从而使肩胛盂凹面增大，进而稳定率提高。比较FCSSR和BSSR，盂唇和软骨的影响导致前后方向上的稳定率提高25%，上下方向上提高7.7%。由于发现骨性和骨软骨性稳定率之间无显著差异，肩胛盂的盂唇似乎是稳定率增加的主要因素。此外，CT和MRI测量结果不具有可转移性。
II级，诊断性研究。
