■目的是评估不同的阴囊偏心对撞击的影响,运动范围(ROM),反向全肩关节置换术(RSA)中标准活动期间的肌肉长度。
■在这项研究中,我们利用计算建模技术来创建经过RSA的原生肩部和肩部模型,并模拟所有外展-内收的肩部运动,屈伸,和旋转。我们测试了总共36种不同的关节盂球配置,其中包括三种不同的下倾角(0°,+10°,+20°)和两个不同的横向偏移(0毫米和+4毫米),以及六种不同的鼓膜偏心率(同心度,劣等,后部,前,前下,和后下)。我们评估了最大无冲击ROM,撞击部位,和肌肉长度。
■在三个平面和总的全局ROM中,所有球球配置都超过了本机肩ROM的50%。在绑架中,不同的椎体球偏心率之间没有显着差异(p>0.05)。在屈伸中,后下偏心在不同的偏心中具有最大的ROM,但不同的椎体球偏心率之间没有显着差异(p>0.05)。在旋转中,总体上有显著差异,与同心度相比,前下偏心度具有显着优势(p<0.05)。在全局ROM中,当侧向偏移为0mm时,前下偏心率比同心度显着优势(p<0.05)。在所有的鼓膜偏心率模型中,只有冈下肌的伸长有统计学意义(p<0.05)。
■球体偏心率显著影响旋转,总的全局ROM,和肩胛骨下肌肉的长度。其中,前下偏移在外展-内收中达到了最大的ROM,旋转,以及全球活动总量。前下关节盂偏心和下关节盂偏心均显示出比旋转同心度和总整体ROM明显的优势。
■基础科学研究;计算机建模。
UNASSIGNED: The aim was to evaluate the effects of different glenosphere eccentricities on
impingement, range of motion (ROM), and muscle length during standard activities in reverse total shoulder arthroplasty (RSA).
UNASSIGNED: In this study, we utilized computational modeling techniques to create native shoulder and shoulder models undergoing RSA and simulate shoulder movements in all abduction-adduction, flexion-extension, and rotation. We tested a total of 36 different glenosphere configurations, which included three different inferior tilts (0°, +10°, +20°) and two different lateral offsets (0 mm and +4 mm), as well as six different glenosphere eccentricities (concentricity, inferior, posterior, anterior, anteroinferior, and posteroinferior). We evaluated the maximum
impingement-free ROM,
impingement sites, and muscle lengths.
UNASSIGNED: All glenosphere configurations exceeded 50% of native shoulder ROM in three planes and total global ROM. In abduction-adduction, there was no significant difference among the different glenosphere eccentricities (p > 0.05). In flexion-extension, the posteroinferior eccentricity had the maximum ROM among the different eccentricities, but no significant difference among the different glenosphere eccentricities (p > 0.05). In rotation, there was a significant difference overall, and anteroinferior eccentricity had a significant advantage over concentricity (p < 0.05). In total global ROM, anteroinferior eccentricity had a significant advantage over concentricity when lateral offset was 0 mm (p < 0.05). In all models of glenosphere eccentricities, only the elongation of the infraspinatus muscle was statistically significant (p < 0.05).
UNASSIGNED: Glenosphere eccentricity significantly influenced rotation, total global ROM, and the length of the subscapularis muscle. Among them, anteroinferior offset achieved the maximum ROM in abduction-adduction, rotation, and total global activities. Both anteroinferior and inferior glenoid eccentricity showed significant advantages over the concentricity in rotation and total global ROM.
UNASSIGNED: Basic Science Study; Computer Modeling.