The Experts below are selected from a list of 138129 Experts worldwide ranked by ideXlab platform
David C Ackland - One of the best experts on this subject based on the ideXlab platform.
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muscle and Joint Function after anatomic and reverse total shoulder arthroplasty using a modular shoulder prosthesis
Journal of Orthopaedic Research, 2019Co-Authors: David C Ackland, Richard Thomas, Minoo Patel, Richard S Page, Morgan Sangeux, Martin RichardsonAbstract:Changes in Joint architecture and muscle loading resulting from total shoulder arthroplasty (TSA) and reverse total shoulder arthroplasty (RSA) are known to influence Joint stability and prosthesis survivorship. This study aimed to measure changes in muscle moment arms, muscle lines of action, as well as muscle and Joint loading following TSA and RSA using a metal-backed uncemented modular shoulder prosthesis. Eight cadaveric upper extremities were assessed using a customized testing rig. Abduction, flexion, and axial rotation muscle moment arms were quantified using the tendon-excursion method, and muscle line-of-force directions evaluated radiographically pre-operatively, and after TSA and revision RSA. Specimen-specific musculoskeletal models were used to estimate muscle and Joint loading pre- and post-operatively. TSA lateralized the glenohumeral Joint center by 4.3 ± 3.2 mm, resulting in small but significant increases in middle deltoid force (2.0%BW) and Joint compression during flexion (2.1%BW) (p < 0.05). Revision RSA significantly increased the moment arms of the major abductors, flexors, adductors, and extensors, and reduced their peak forces (p < 0.05). The superior inclination of the deltoid significantly increased while the inferior inclination of the rotator cuff muscles decreased (p < 0.05). TSA using an uncemented metal-backed modular shoulder prosthesis effectively restores native Joint Function; however, lateralization of the glenoid component should be minimized intra-operatively to mitigate increased glenohumeral Joint loading and polyethylene liner contact stresses. Revision RSA reduces muscle forces required during shoulder Function but produces greater superior Joint shear force and less Joint compression. The findings may help to guide component selection and placement to mitigate Joint instability after arthroplasty. © 2019 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 37:1988-2003, 2019.
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Muscle and Joint Function After Anatomic and Reverse Total Shoulder Arthroplasty Using a Modular Shoulder Prosthesis
Journal of Orthopaedic Research, 2019Co-Authors: David C Ackland, Richard Thomas, Minoo Patel, Richard S Page, Morgan Sangeux, Martin RichardsonAbstract:Changes in Joint architecture and muscle loading resulting from total shoulder arthroplasty (TSA) and reverse total shoulder arthroplasty (RSA) are known to influence Joint stability and prosthesis survivorship. This study aimed to measure changes in muscle moment arms, muscle lines of action, as well as muscle and Joint loading following TSA and RSA using a metal-backed uncemented modular shoulder prosthesis. Eight cadaveric upper extremities were assessed using a customized testing rig. Abduction, flexion, and axial rotation muscle moment arms were quantified using the tendon-excursion method, and muscle line-of-force directions evaluated radiographically pre-operatively, and after TSA and revision RSA. Specimen-specific musculoskeletal models were used to estimate muscle and Joint loading pre- and post-operatively. TSA lateralized the glenohumeral Joint center by 4.3 ± 3.2 mm, resulting in small but significant increases in middle deltoid force (2.0%BW) and Joint compression during flexion (2.1%BW) (p
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Modulation of shoulder muscle and Joint Function using a powered upper-limb exoskeleton.
Journal of biomechanics, 2018Co-Authors: Justin Fong, Vincent Crocher, Peter Vee Sin Lee, Denny Oetomo, Ying Tan, David C AcklandAbstract:Abstract Robotic-assistive exoskeletons can enable frequent repetitive movements without the presence of a full-time therapist; however, human-machine interaction and the capacity of powered exoskeletons to attenuate shoulder muscle and Joint loading is poorly understood. This study aimed to quantify shoulder muscle and Joint force during assisted activities of daily living using a powered robotic upper limb exoskeleton (ArmeoPower, Hocoma). Six healthy male subjects performed abduction, flexion, horizontal flexion, reaching and nose touching activities. These tasks were repeated under two conditions: (i) the exoskeleton compensating only for its own weight, and (ii) the exoskeleton providing full upper limb gravity compensation (i.e., weightlessness). Muscle EMG, Joint kinematics and Joint torques were simultaneously recorded, and shoulder muscle and Joint forces calculated using personalized musculoskeletal models of each subject’s upper limb. The exoskeleton reduced peak Joint torques, muscle forces and Joint loading by up to 74.8% (0.113 Nm/kg), 88.8% (5.8%BW) and 68.4% (75.6%BW), respectively, with the degree of load attenuation strongly task dependent. The peak compressive, anterior and superior glenohumeral Joint force during assisted nose touching was 36.4% (24.6%BW), 72.4% (13.1%BW) and 85.0% (17.2%BW) lower than that during unassisted nose touching, respectively. The present study showed that upper limb weight compensation using an assistive exoskeleton may increase glenohumeral Joint stability, since deltoid muscle force, which is the primary contributor to superior glenohumeral Joint shear, is attenuated; however, prominent exoskeleton interaction moments are required to position and control the upper limb in space, even under full gravity compensation conditions. The modeling framework and results may be useful in planning targeted upper limb robotic rehabilitation tasks.
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subject specific musculoskeletal modeling in the evaluation of shoulder muscle and Joint Function
Journal of Biomechanics, 2016Co-Authors: Peter Vee Sin Lee, Adam L Bryant, Mary P Galea, David C AcklandAbstract:Upper limb muscle force estimation using Hill-type muscle models depends on musculotendon parameter values, which cannot be readily measured non-invasively. Generic and scaled-generic parameters may be quickly and easily employed, but these approaches do not account for an individual subject’s Joint torque capacity. The objective of the present study was to develop a subject-specific experimental testing and modeling framework to evaluate shoulder muscle and Joint Function during activities of daily living, and to assess the capacity of generic and scaled-generic musculotendon parameters to predict muscle and Joint Function. Three-dimensional musculoskeletal models of the shoulders of 6 healthy subjects were developed to calculate muscle and glenohumeral Joint loading during abduction, flexion, horizontal flexion, nose touching and reaching using subject-specific, scaled-generic and generic musculotendon parameters. Muscle and glenohumeral Joint forces calculated using generic and scaled-generic models were significantly different to those of subject-specific models (p<0.05), and task dependent; however, scaled-generic model calculations of shoulder glenohumeral Joint force demonstrated better agreement with those of subject-specific models during abduction and flexion. Muscles in generic musculoskeletal models operated further from the plateau of their force–length curves than those of scaled-generic and subject-specific models, while muscles in subject-specific models operated over a wider region of their force length curves than those of the generic or scaled-generic models, reflecting diversity of subject shoulder strength. The findings of this study suggest that generic and scaled-generic musculotendon parameters may not provide sufficient accuracy in prediction of shoulder muscle and Joint loading when compared to models that employ subject-specific parameter-estimation approaches.
Martin Richardson - One of the best experts on this subject based on the ideXlab platform.
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muscle and Joint Function after anatomic and reverse total shoulder arthroplasty using a modular shoulder prosthesis
Journal of Orthopaedic Research, 2019Co-Authors: David C Ackland, Richard Thomas, Minoo Patel, Richard S Page, Morgan Sangeux, Martin RichardsonAbstract:Changes in Joint architecture and muscle loading resulting from total shoulder arthroplasty (TSA) and reverse total shoulder arthroplasty (RSA) are known to influence Joint stability and prosthesis survivorship. This study aimed to measure changes in muscle moment arms, muscle lines of action, as well as muscle and Joint loading following TSA and RSA using a metal-backed uncemented modular shoulder prosthesis. Eight cadaveric upper extremities were assessed using a customized testing rig. Abduction, flexion, and axial rotation muscle moment arms were quantified using the tendon-excursion method, and muscle line-of-force directions evaluated radiographically pre-operatively, and after TSA and revision RSA. Specimen-specific musculoskeletal models were used to estimate muscle and Joint loading pre- and post-operatively. TSA lateralized the glenohumeral Joint center by 4.3 ± 3.2 mm, resulting in small but significant increases in middle deltoid force (2.0%BW) and Joint compression during flexion (2.1%BW) (p < 0.05). Revision RSA significantly increased the moment arms of the major abductors, flexors, adductors, and extensors, and reduced their peak forces (p < 0.05). The superior inclination of the deltoid significantly increased while the inferior inclination of the rotator cuff muscles decreased (p < 0.05). TSA using an uncemented metal-backed modular shoulder prosthesis effectively restores native Joint Function; however, lateralization of the glenoid component should be minimized intra-operatively to mitigate increased glenohumeral Joint loading and polyethylene liner contact stresses. Revision RSA reduces muscle forces required during shoulder Function but produces greater superior Joint shear force and less Joint compression. The findings may help to guide component selection and placement to mitigate Joint instability after arthroplasty. © 2019 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 37:1988-2003, 2019.
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Muscle and Joint Function After Anatomic and Reverse Total Shoulder Arthroplasty Using a Modular Shoulder Prosthesis
Journal of Orthopaedic Research, 2019Co-Authors: David C Ackland, Richard Thomas, Minoo Patel, Richard S Page, Morgan Sangeux, Martin RichardsonAbstract:Changes in Joint architecture and muscle loading resulting from total shoulder arthroplasty (TSA) and reverse total shoulder arthroplasty (RSA) are known to influence Joint stability and prosthesis survivorship. This study aimed to measure changes in muscle moment arms, muscle lines of action, as well as muscle and Joint loading following TSA and RSA using a metal-backed uncemented modular shoulder prosthesis. Eight cadaveric upper extremities were assessed using a customized testing rig. Abduction, flexion, and axial rotation muscle moment arms were quantified using the tendon-excursion method, and muscle line-of-force directions evaluated radiographically pre-operatively, and after TSA and revision RSA. Specimen-specific musculoskeletal models were used to estimate muscle and Joint loading pre- and post-operatively. TSA lateralized the glenohumeral Joint center by 4.3 ± 3.2 mm, resulting in small but significant increases in middle deltoid force (2.0%BW) and Joint compression during flexion (2.1%BW) (p
Dongmei He - One of the best experts on this subject based on the ideXlab platform.
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preliminary clinical study of chinese standard alloplastic temporomandibular Joint prosthesis
Journal of Cranio-maxillofacial Surgery, 2019Co-Authors: Jieyun Zhao, Dongmei HeAbstract:Abstract Purpose To evaluate the preliminary clinical outcomes on the Chinese standard temporomandibular Joint (TMJ) prostheses. Patients and methods Patients who underwent Zimmer Biomet and Chinese standard prostheses by one surgeon between January 1st 2016 and June 30th 2017 were included in the study. Maximum incisal opening (MIO), pain, diet, and Joint Function were measured; CT scans were taken before and after the operation and during at least a 12-months follow-up for evaluation. Results Thirty-five patients including 12 with Chinese standard prostheses and 23 with Biomet stock prostheses participated in the study. After an average of 14.3 months follow-up, both types of prostheses could significantly improve MIO, diet, and Joint Function, and relieve pain (p 0.05). A computed tomography (CT) scan showed that no prostheses dislocated or broke, no screws loosened, and ectopic bone formation appeared around the alloplastic condyle. Conclusion Chinese standard TMJ prostheses are effective and stable in clinical application. They can significantly improve mouth opening, diet, and Joint Function and relieve pain.
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navigation guided resection for a tenosynovial giant cell tumor involving the temporomandibular Joint and skull base
Journal of Craniofacial Surgery, 2012Co-Authors: Dongmei He, Chi Yang, Guofang Shen, Minjie Chen, Xiujuan Yang, Dong Huang, Qin Zhou, Peihua Wang, Ming YeAbstract:: Tenosynovial giant cell tumor is a very rare, benign lesion from the synovium. It seldom happens in the temporomandibular Joint area and skull base that is difficult to resect and reconstruct. We present a case treated with computer-assisted navigation to help mark the tumor boundaries, protect vital structures, and facilitate the reconstruction process. Follow-up at 6 months after surgery showed no tumor recurrent and good temporomandibular Joint Function.
Richard S Page - One of the best experts on this subject based on the ideXlab platform.
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muscle and Joint Function after anatomic and reverse total shoulder arthroplasty using a modular shoulder prosthesis
Journal of Orthopaedic Research, 2019Co-Authors: David C Ackland, Richard Thomas, Minoo Patel, Richard S Page, Morgan Sangeux, Martin RichardsonAbstract:Changes in Joint architecture and muscle loading resulting from total shoulder arthroplasty (TSA) and reverse total shoulder arthroplasty (RSA) are known to influence Joint stability and prosthesis survivorship. This study aimed to measure changes in muscle moment arms, muscle lines of action, as well as muscle and Joint loading following TSA and RSA using a metal-backed uncemented modular shoulder prosthesis. Eight cadaveric upper extremities were assessed using a customized testing rig. Abduction, flexion, and axial rotation muscle moment arms were quantified using the tendon-excursion method, and muscle line-of-force directions evaluated radiographically pre-operatively, and after TSA and revision RSA. Specimen-specific musculoskeletal models were used to estimate muscle and Joint loading pre- and post-operatively. TSA lateralized the glenohumeral Joint center by 4.3 ± 3.2 mm, resulting in small but significant increases in middle deltoid force (2.0%BW) and Joint compression during flexion (2.1%BW) (p < 0.05). Revision RSA significantly increased the moment arms of the major abductors, flexors, adductors, and extensors, and reduced their peak forces (p < 0.05). The superior inclination of the deltoid significantly increased while the inferior inclination of the rotator cuff muscles decreased (p < 0.05). TSA using an uncemented metal-backed modular shoulder prosthesis effectively restores native Joint Function; however, lateralization of the glenoid component should be minimized intra-operatively to mitigate increased glenohumeral Joint loading and polyethylene liner contact stresses. Revision RSA reduces muscle forces required during shoulder Function but produces greater superior Joint shear force and less Joint compression. The findings may help to guide component selection and placement to mitigate Joint instability after arthroplasty. © 2019 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 37:1988-2003, 2019.
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Muscle and Joint Function After Anatomic and Reverse Total Shoulder Arthroplasty Using a Modular Shoulder Prosthesis
Journal of Orthopaedic Research, 2019Co-Authors: David C Ackland, Richard Thomas, Minoo Patel, Richard S Page, Morgan Sangeux, Martin RichardsonAbstract:Changes in Joint architecture and muscle loading resulting from total shoulder arthroplasty (TSA) and reverse total shoulder arthroplasty (RSA) are known to influence Joint stability and prosthesis survivorship. This study aimed to measure changes in muscle moment arms, muscle lines of action, as well as muscle and Joint loading following TSA and RSA using a metal-backed uncemented modular shoulder prosthesis. Eight cadaveric upper extremities were assessed using a customized testing rig. Abduction, flexion, and axial rotation muscle moment arms were quantified using the tendon-excursion method, and muscle line-of-force directions evaluated radiographically pre-operatively, and after TSA and revision RSA. Specimen-specific musculoskeletal models were used to estimate muscle and Joint loading pre- and post-operatively. TSA lateralized the glenohumeral Joint center by 4.3 ± 3.2 mm, resulting in small but significant increases in middle deltoid force (2.0%BW) and Joint compression during flexion (2.1%BW) (p
Morgan Sangeux - One of the best experts on this subject based on the ideXlab platform.
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muscle and Joint Function after anatomic and reverse total shoulder arthroplasty using a modular shoulder prosthesis
Journal of Orthopaedic Research, 2019Co-Authors: David C Ackland, Richard Thomas, Minoo Patel, Richard S Page, Morgan Sangeux, Martin RichardsonAbstract:Changes in Joint architecture and muscle loading resulting from total shoulder arthroplasty (TSA) and reverse total shoulder arthroplasty (RSA) are known to influence Joint stability and prosthesis survivorship. This study aimed to measure changes in muscle moment arms, muscle lines of action, as well as muscle and Joint loading following TSA and RSA using a metal-backed uncemented modular shoulder prosthesis. Eight cadaveric upper extremities were assessed using a customized testing rig. Abduction, flexion, and axial rotation muscle moment arms were quantified using the tendon-excursion method, and muscle line-of-force directions evaluated radiographically pre-operatively, and after TSA and revision RSA. Specimen-specific musculoskeletal models were used to estimate muscle and Joint loading pre- and post-operatively. TSA lateralized the glenohumeral Joint center by 4.3 ± 3.2 mm, resulting in small but significant increases in middle deltoid force (2.0%BW) and Joint compression during flexion (2.1%BW) (p < 0.05). Revision RSA significantly increased the moment arms of the major abductors, flexors, adductors, and extensors, and reduced their peak forces (p < 0.05). The superior inclination of the deltoid significantly increased while the inferior inclination of the rotator cuff muscles decreased (p < 0.05). TSA using an uncemented metal-backed modular shoulder prosthesis effectively restores native Joint Function; however, lateralization of the glenoid component should be minimized intra-operatively to mitigate increased glenohumeral Joint loading and polyethylene liner contact stresses. Revision RSA reduces muscle forces required during shoulder Function but produces greater superior Joint shear force and less Joint compression. The findings may help to guide component selection and placement to mitigate Joint instability after arthroplasty. © 2019 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 37:1988-2003, 2019.
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Muscle and Joint Function After Anatomic and Reverse Total Shoulder Arthroplasty Using a Modular Shoulder Prosthesis
Journal of Orthopaedic Research, 2019Co-Authors: David C Ackland, Richard Thomas, Minoo Patel, Richard S Page, Morgan Sangeux, Martin RichardsonAbstract:Changes in Joint architecture and muscle loading resulting from total shoulder arthroplasty (TSA) and reverse total shoulder arthroplasty (RSA) are known to influence Joint stability and prosthesis survivorship. This study aimed to measure changes in muscle moment arms, muscle lines of action, as well as muscle and Joint loading following TSA and RSA using a metal-backed uncemented modular shoulder prosthesis. Eight cadaveric upper extremities were assessed using a customized testing rig. Abduction, flexion, and axial rotation muscle moment arms were quantified using the tendon-excursion method, and muscle line-of-force directions evaluated radiographically pre-operatively, and after TSA and revision RSA. Specimen-specific musculoskeletal models were used to estimate muscle and Joint loading pre- and post-operatively. TSA lateralized the glenohumeral Joint center by 4.3 ± 3.2 mm, resulting in small but significant increases in middle deltoid force (2.0%BW) and Joint compression during flexion (2.1%BW) (p
