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- W4387345306 abstract "Abstract Background Few studies have investigated the kinematics after reverse total shoulder arthroplasty (RTSA). This study aimed to compare the shoulder kinematics in RTSA patients during shoulder abduction on the scapular plane with and without a load and yield information regarding the function of stabilizing the joints against gravity for the functional assessment of the shoulder after RTSA, which could lead to changes in postoperative rehabilitation treatment. Methods Twenty RTSA patients (7 men, 13 women; mean age: 78.1 [64–90] years) were examined. First, active shoulder abduction in the scapular plane was captured using single-plane fluoroscopic X -ray images. Imaging was performed by stipulating that one shoulder abduction cycle should be completed in 6 s. Two trials were conducted: one under a load equivalent to 2% of body weight and one without a load. Next, a three-dimensional (3D) model of each humeral and scapular component was matched to the silhouette of the fluoroscopic image to estimate the 3D dynamics. By using the 3D dynamic model obtained, the kinematics of the glenosphere and humeral implant were calculated relative to the shoulder abduction angle on the scapular plane and were compared between groups with and without a load. A one-way analysis of variance and a post hoc paired t -test with a statistical significance level of 0.05 were performed. Results The humeral internal rotation decreased with a load at shoulder abduction between 40° and 90° on the scapular plane ( P < 0.01, effect size: 0.15). No significant differences in scapular upward rotation ( P = 0.57, effect size: 0.022), external rotation ( P = 0.83, effect size: 0.0083) and posterior tilting ( P = 0.74, effect size: 0.013) were observed between groups with and without a load. The main effect was not observed with and without a load ( P = 0.86, effect size: 0.0072). However, the scapulohumeral rhythm was significantly greater without a load during shoulder joint abduction between 40° and 60° on the scapular plane. Conclusion In RTSA patients, the glenohumeral joint was less internally rotated, and the scapulohumeral rhythm decreased under loaded conditions. It was stabilized against the load through the mechanical advantage of the deltoid muscle and other muscles." @default.
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- W4387345306 date "2023-10-05" @default.
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- W4387345306 title "Analysis of in vivo humeral rotation of reverse total shoulder arthroplasty patients during shoulder abduction on the scapular plane with a load" @default.
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- W4387345306 doi "https://doi.org/10.1186/s42836-023-00207-1" @default.
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