The Experts below are selected from a list of 75 Experts worldwide ranked by ideXlab platform
Peter Reilly - One of the best experts on this subject based on the ideXlab platform.
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A biomechanical confirmation of the relationship between critical Shoulder angle (CSA) and articular joint loading
Journal of Shoulder and Elbow Surgery, 2020Co-Authors: Guillaume Villatte, Eline Van Der Kruk, Asim Bhuta, Matthias Zumstein, Beat Moor, Roger J.h. Emery, Anthony M.j. Bull, Peter ReillyAbstract:Background The critical Shoulder angle (CSA) has been shown to be correlated with Shoulder Disease states. The biomechanical hypothesis to explain this correlation is that the CSA changes the shear and compressive forces on the Shoulder. The objective of this study is to test this hypothesis by use of a validated computational Shoulder model. Specifically, this study assesses the impact on glenohumeral biomechanics of modifying the CSA. Methods An inverse dynamics 3-dimensional musculoskeletal model of the Shoulder was used to quantify muscle forces and glenohumeral joint forces. The CSA was changed by altering the attachment point of the middle deltoid into a normal CSA (33°), a reduced CSA of 28°, and an increased CSA of 38°. Subject-specific kinematics of slow and fast speed abduction in the scapular plane and slow and fast forward flexion measured by a 3-dimensional motion capture system were used to quantify joint reaction shear and compressive forces. Results Increasing the CSA results in increased superior-inferior forces (shearing forces; integrated over the range of motion; P < .05). Reducing CSA results in increased lateromedial (compressive) forces for both the maximum and integrated sum of the forces over the whole motion (P < .01). Discussion/Conclusion Changes in the CSA modify glenohumeral joint biomechanics with increasing CSA producing higher shear forces that could contribute to rotator cuff overuse, whereas reducing the CSA results in higher compressive forces that contribute to joint wear.
Guillaume Villatte - One of the best experts on this subject based on the ideXlab platform.
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A biomechanical confirmation of the relationship between critical Shoulder angle (CSA) and articular joint loading
Journal of Shoulder and Elbow Surgery, 2020Co-Authors: Guillaume Villatte, Eline Van Der Kruk, Asim Bhuta, Matthias Zumstein, Beat Moor, Roger J.h. Emery, Anthony M.j. Bull, Peter ReillyAbstract:Background The critical Shoulder angle (CSA) has been shown to be correlated with Shoulder Disease states. The biomechanical hypothesis to explain this correlation is that the CSA changes the shear and compressive forces on the Shoulder. The objective of this study is to test this hypothesis by use of a validated computational Shoulder model. Specifically, this study assesses the impact on glenohumeral biomechanics of modifying the CSA. Methods An inverse dynamics 3-dimensional musculoskeletal model of the Shoulder was used to quantify muscle forces and glenohumeral joint forces. The CSA was changed by altering the attachment point of the middle deltoid into a normal CSA (33°), a reduced CSA of 28°, and an increased CSA of 38°. Subject-specific kinematics of slow and fast speed abduction in the scapular plane and slow and fast forward flexion measured by a 3-dimensional motion capture system were used to quantify joint reaction shear and compressive forces. Results Increasing the CSA results in increased superior-inferior forces (shearing forces; integrated over the range of motion; P < .05). Reducing CSA results in increased lateromedial (compressive) forces for both the maximum and integrated sum of the forces over the whole motion (P < .01). Discussion/Conclusion Changes in the CSA modify glenohumeral joint biomechanics with increasing CSA producing higher shear forces that could contribute to rotator cuff overuse, whereas reducing the CSA results in higher compressive forces that contribute to joint wear.
S Amato - One of the best experts on this subject based on the ideXlab platform.
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is tennis a predisposing factor for degenerative Shoulder Disease a controlled study in former elite players
British Journal of Sports Medicine, 2006Co-Authors: J Maquirriain, J P Ghisi, S AmatoAbstract:Background: High demands imposed to the Shoulder during tennis activity can decrease the efficiency of static and dynamic constraints. Subtle or frank instability of the glenohumeral joint may occur, and long term degenerative changes may be expected. Objective: To determine and compare the prevalence of primary glenohumeral osteoarthritis in senior tennis players and matched controls. Study design: Cross sectional controlled study. Methods: 18 asymptomatic senior tennis players were studied (17 male; mean (SD) age, 57.2 (8.8) years) with no history of Shoulder surgery or major trauma. There were 18 matched controls. Radiographs were used to determine glenohumeral osteoarthritic changes: joint space narrowing, humeral and glenoid subchondral sclerosis, humeral and glenoid juxta-articular cysts, osteophytes, humeral and glenoid flattening, humeral posterior displacement and glenoid posterior erosion. Findings were classified as normal, minimal, moderate, or severe changes. Results: 33% of the players (95% confidence interval (CI), 13% to 59%) had osteoarthritic changes in their dominant Shoulder (n = 6; five with minimal changes, one with moderate changes), and 11% of the controls (95% CI, 1% to 34%) had articular degeneration on their dominant side (n = 2; both minimal changes) (p = 0.04, Wilcoxon test). The osteoarthritic group was significantly older than the players without degenerative changes (p = 0.008). Conclusions: The prevalence of glenohumeral osteoarthritis in the dominant Shoulder was greater in former elite tennis players than in sedentary controls. Prolonged intensive tennis practice may be a predisposing factor for the development of mild degenerative articular changes in the dominant Shoulder.
M Backhaus - One of the best experts on this subject based on the ideXlab platform.
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reliability of ultrasonography in detecting Shoulder Disease in patients with rheumatoid arthritis
Annals of the Rheumatic Diseases, 2009Co-Authors: George A W Bruyn, Esperanza Naredo, Ingrid Moller, C Moragues, Jesus Garrido, G H De Bock, M A Dagostino, Emilio Filippucci, Annamaria Iagnocco, M BackhausAbstract:Objective: To assess the intra and interobserver reproducibility of musculoskeletal ultrasonography (US) among rheumatologists in detecting destructive and inflammatory Shoulder abnormalities in patients with rheumatoid arthritis (RA) and to determine the overall agreement between US and MRI. Methods: A total of 14 observers examined 5 patients in 2 rounds independently and blindly of each other. US results were compared with MRI. Overall agreement of all findings, of positive findings on MRI, as well as intra and interobserver reliabilities, were calculated. Results: Overall agreement between US and MRI was seen in 79% with regard to humeral head erosions (HHE), in 64% with regard to posterior recess synovitis (PRS), in 31% with regard to axillary recess synovitis (ARS), in 64% with regard to bursitis, in 50% with regard to biceps tenosynovitis (BT), and in 84% for complete cuff tear (CCT). Intraobserver and interobserver κ was 0.69 and 0.43 for HHE, 0.29 and 0.49 for PRS, 0.57 and 1.00 for ARS, −0.17 and 0.51 for bursitis, 0.17 and 0.46 for BT and 0.52 and 0.6 for CCT, respectively. The intraobserver and interobserver κ for power Doppler (PD) was 0.90 and 0.70 for glenohumeral signals and 0.60 and 0.51 for bursal signals, respectively. Conclusions: US is a reliable imaging technique for most Shoulder pathology in RA especially with regard to PD. Standardisation of scanning technique and definitions of particular lesions may further enhance the reliability of US investigation of the Shoulder.
Matthias Zumstein - One of the best experts on this subject based on the ideXlab platform.
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A biomechanical confirmation of the relationship between critical Shoulder angle (CSA) and articular joint loading
Journal of Shoulder and Elbow Surgery, 2020Co-Authors: Guillaume Villatte, Eline Van Der Kruk, Asim Bhuta, Matthias Zumstein, Beat Moor, Roger J.h. Emery, Anthony M.j. Bull, Peter ReillyAbstract:Background The critical Shoulder angle (CSA) has been shown to be correlated with Shoulder Disease states. The biomechanical hypothesis to explain this correlation is that the CSA changes the shear and compressive forces on the Shoulder. The objective of this study is to test this hypothesis by use of a validated computational Shoulder model. Specifically, this study assesses the impact on glenohumeral biomechanics of modifying the CSA. Methods An inverse dynamics 3-dimensional musculoskeletal model of the Shoulder was used to quantify muscle forces and glenohumeral joint forces. The CSA was changed by altering the attachment point of the middle deltoid into a normal CSA (33°), a reduced CSA of 28°, and an increased CSA of 38°. Subject-specific kinematics of slow and fast speed abduction in the scapular plane and slow and fast forward flexion measured by a 3-dimensional motion capture system were used to quantify joint reaction shear and compressive forces. Results Increasing the CSA results in increased superior-inferior forces (shearing forces; integrated over the range of motion; P < .05). Reducing CSA results in increased lateromedial (compressive) forces for both the maximum and integrated sum of the forces over the whole motion (P < .01). Discussion/Conclusion Changes in the CSA modify glenohumeral joint biomechanics with increasing CSA producing higher shear forces that could contribute to rotator cuff overuse, whereas reducing the CSA results in higher compressive forces that contribute to joint wear.