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• W2893822196 abstract "Purpose To answer 2 questions: What is the main structure that prevents the superior translation of the humeral head, the supraspinatus or the superior capsule (SC)? And what mechanism does the principal structure rely on to prevent the superior translation of the humeral head, the spacer effect or the tensional hammock effect? Methods Eight shoulder specimens were assessed using a custom biomechanical testing system. Glenohumeral superior translation and subacromial peak pressure were compared using 6 models: the intact joint model, supraspinatus dysfunction model, supraspinatus defect model, SC tear model, SC defect model, and irreparable rotator cuff tear (IRCT) model. Results Compared with the intact joint model, the supraspinatus defect model significantly increased the superior translation (by 2.6 mm; P < .001) and subacromial peak pressure (by 0.43 MPa; P = .013) at 0° glenohumeral abduction, while the SC defect model unremarkably altered the superior translation at 0° (by 0.6 mm; P = .582) and 45° (by 0.3 mm; P = .867) of glenohumeral abduction and the subacromial peak pressure at 0° (by 0.11 MPa; P = .961), 30° (by −0.03 MPa; P = .997), and 45° (by -0.33 MPa; P = .485) of glenohumeral abduction. The supraspinatus dysfunction model significantly increased the superior translation at 0° (by 1.7 mm; P < .001), 30° (by 1.2 mm; P = .005), and 45° (by 0.8 mm; P = .026) of glenohumeral abduction, but not the subacromial peak pressure compared with the intact joint model. However, no significant differences were found between the supraspinatus defect model and the supraspinatus dysfunction model with respect to the superior translation or subacromial peak pressure (all P > .05). Conclusions The anatomic SC has a negligible role in preventing the superior translation of the humeral head. Clinical Relevance SC reconstruction is not a simple anatomic reconstruction, and its promising clinical outcome may be due to tensional fixation technique and choice of graft. To answer 2 questions: What is the main structure that prevents the superior translation of the humeral head, the supraspinatus or the superior capsule (SC)? And what mechanism does the principal structure rely on to prevent the superior translation of the humeral head, the spacer effect or the tensional hammock effect? Eight shoulder specimens were assessed using a custom biomechanical testing system. Glenohumeral superior translation and subacromial peak pressure were compared using 6 models: the intact joint model, supraspinatus dysfunction model, supraspinatus defect model, SC tear model, SC defect model, and irreparable rotator cuff tear (IRCT) model. Compared with the intact joint model, the supraspinatus defect model significantly increased the superior translation (by 2.6 mm; P < .001) and subacromial peak pressure (by 0.43 MPa; P = .013) at 0° glenohumeral abduction, while the SC defect model unremarkably altered the superior translation at 0° (by 0.6 mm; P = .582) and 45° (by 0.3 mm; P = .867) of glenohumeral abduction and the subacromial peak pressure at 0° (by 0.11 MPa; P = .961), 30° (by −0.03 MPa; P = .997), and 45° (by -0.33 MPa; P = .485) of glenohumeral abduction. The supraspinatus dysfunction model significantly increased the superior translation at 0° (by 1.7 mm; P < .001), 30° (by 1.2 mm; P = .005), and 45° (by 0.8 mm; P = .026) of glenohumeral abduction, but not the subacromial peak pressure compared with the intact joint model. However, no significant differences were found between the supraspinatus defect model and the supraspinatus dysfunction model with respect to the superior translation or subacromial peak pressure (all P > .05). The anatomic SC has a negligible role in preventing the superior translation of the humeral head." @default.
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• W2893822196 date "2018-11-01" @default.
• W2893822196 modified "2023-10-04" @default.
• W2893822196 title "The Superior Glenohumeral Joint Capsule Alone Does Not Prevent Superior Translation of the Humeral Head: An In Vitro Biomechanical Study" @default.
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• W2893822196 doi "https://doi.org/10.1016/j.arthro.2018.06.025" @default.
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