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Steven L Fischer - One of the best experts on this subject based on the ideXlab platform.
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evaluating the ergonomic benefit of a Wrist brace on Wrist posture muscle activity rotational stiffness and peak shovel ground impact force during a simulated tree planting task
Human Factors, 2017Co-Authors: Peter J Sheahan, Joshua G A Cashaback, Steven L FischerAbstract:Background Tree planters are at a high risk for Wrist Injury due to awkward postures and high Wrist loads experienced during each planting cycle, specifically at shovel-ground impact. Wrist joint stiffness provides a measure that integrates postural and loading information. Objective The purpose of this study was to evaluate Wrist joint stiffness requirements at the instant of shovel-ground impact during tree planting and determine if a Wrist brace could alter muscular contributions to Wrist joint stiffness. Method Planters simulated tree planting with and without wearing a brace on their planting arm. Surface electromyography (sEMG) from six forearm muscles and Wrist kinematics were collected and used to calculate muscular contributions to joint rotational stiffness about the Wrist. Results Wrist joint stiffness increased with brace use, an unanticipated and negative consequence of wearing a brace. As a potential benefit, planters achieved a more neutrally oriented Wrist angle about the flexion/extension axis, although a less neutral Wrist angle about the ulnar/radial axis was observed. Muscle activity did not change between conditions. Conclusion The joint stiffness analysis, combining kinematic and sEMG information in a biologically relevant manner, revealed clear limitations with the interface between the brace grip and shovel handle that jeopardized the prophylactic benefits of the current brace design. This limitation was not as evident when considering kinematics and sEMG data independently. Application A neuromechanical model (joint rotational stiffness) enhanced our ability to evaluate the brace design relative to kinematic and sEMG parameter-based metrics alone.
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evaluating the ergonomic benefit of a Wrist brace on Wrist posture muscle activity rotational stiffness and peak shovel ground impact force during a simulated tree planting task
Human Factors, 2017Co-Authors: Peter J Sheahan, Joshua G A Cashaback, Steven L FischerAbstract:BackgroundTree planters are at a high risk for Wrist Injury due to awkward postures and high Wrist loads experienced during each planting cycle, specifically at shovel-ground impact. Wrist joint st...
Peter J Sheahan - One of the best experts on this subject based on the ideXlab platform.
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evaluating the ergonomic benefit of a Wrist brace on Wrist posture muscle activity rotational stiffness and peak shovel ground impact force during a simulated tree planting task
Human Factors, 2017Co-Authors: Peter J Sheahan, Joshua G A Cashaback, Steven L FischerAbstract:Background Tree planters are at a high risk for Wrist Injury due to awkward postures and high Wrist loads experienced during each planting cycle, specifically at shovel-ground impact. Wrist joint stiffness provides a measure that integrates postural and loading information. Objective The purpose of this study was to evaluate Wrist joint stiffness requirements at the instant of shovel-ground impact during tree planting and determine if a Wrist brace could alter muscular contributions to Wrist joint stiffness. Method Planters simulated tree planting with and without wearing a brace on their planting arm. Surface electromyography (sEMG) from six forearm muscles and Wrist kinematics were collected and used to calculate muscular contributions to joint rotational stiffness about the Wrist. Results Wrist joint stiffness increased with brace use, an unanticipated and negative consequence of wearing a brace. As a potential benefit, planters achieved a more neutrally oriented Wrist angle about the flexion/extension axis, although a less neutral Wrist angle about the ulnar/radial axis was observed. Muscle activity did not change between conditions. Conclusion The joint stiffness analysis, combining kinematic and sEMG information in a biologically relevant manner, revealed clear limitations with the interface between the brace grip and shovel handle that jeopardized the prophylactic benefits of the current brace design. This limitation was not as evident when considering kinematics and sEMG data independently. Application A neuromechanical model (joint rotational stiffness) enhanced our ability to evaluate the brace design relative to kinematic and sEMG parameter-based metrics alone.
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evaluating the ergonomic benefit of a Wrist brace on Wrist posture muscle activity rotational stiffness and peak shovel ground impact force during a simulated tree planting task
Human Factors, 2017Co-Authors: Peter J Sheahan, Joshua G A Cashaback, Steven L FischerAbstract:BackgroundTree planters are at a high risk for Wrist Injury due to awkward postures and high Wrist loads experienced during each planting cycle, specifically at shovel-ground impact. Wrist joint st...
Joshua G A Cashaback - One of the best experts on this subject based on the ideXlab platform.
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evaluating the ergonomic benefit of a Wrist brace on Wrist posture muscle activity rotational stiffness and peak shovel ground impact force during a simulated tree planting task
Human Factors, 2017Co-Authors: Peter J Sheahan, Joshua G A Cashaback, Steven L FischerAbstract:Background Tree planters are at a high risk for Wrist Injury due to awkward postures and high Wrist loads experienced during each planting cycle, specifically at shovel-ground impact. Wrist joint stiffness provides a measure that integrates postural and loading information. Objective The purpose of this study was to evaluate Wrist joint stiffness requirements at the instant of shovel-ground impact during tree planting and determine if a Wrist brace could alter muscular contributions to Wrist joint stiffness. Method Planters simulated tree planting with and without wearing a brace on their planting arm. Surface electromyography (sEMG) from six forearm muscles and Wrist kinematics were collected and used to calculate muscular contributions to joint rotational stiffness about the Wrist. Results Wrist joint stiffness increased with brace use, an unanticipated and negative consequence of wearing a brace. As a potential benefit, planters achieved a more neutrally oriented Wrist angle about the flexion/extension axis, although a less neutral Wrist angle about the ulnar/radial axis was observed. Muscle activity did not change between conditions. Conclusion The joint stiffness analysis, combining kinematic and sEMG information in a biologically relevant manner, revealed clear limitations with the interface between the brace grip and shovel handle that jeopardized the prophylactic benefits of the current brace design. This limitation was not as evident when considering kinematics and sEMG data independently. Application A neuromechanical model (joint rotational stiffness) enhanced our ability to evaluate the brace design relative to kinematic and sEMG parameter-based metrics alone.
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evaluating the ergonomic benefit of a Wrist brace on Wrist posture muscle activity rotational stiffness and peak shovel ground impact force during a simulated tree planting task
Human Factors, 2017Co-Authors: Peter J Sheahan, Joshua G A Cashaback, Steven L FischerAbstract:BackgroundTree planters are at a high risk for Wrist Injury due to awkward postures and high Wrist loads experienced during each planting cycle, specifically at shovel-ground impact. Wrist joint st...
G. Thomas - One of the best experts on this subject based on the ideXlab platform.
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EXPERIENCE OF THE EARLY USE OF TECHNETIUM 99 BONE SCINTIGRAPHY IN Wrist Injury
2016Co-Authors: D. J. Shewring, R. Savage, G. ThomasAbstract:In a retrospective study, patients with suspected scaphoid fracture had an average of three sets of scaphoid radiographs prior to scintigraphy. Scans were performed an average of 3 months after Injury and many were inconclusive because of disuse changes. A prospective analysis of early scintigraphy in 35 cases over 18 months was carried out. Scans were performed at an average of 15.5 days after Injury in selected cases. Patients had an average of 1.28 sets of negative radiographs prior to scanning. There were no false negative scans and in 13 with focal uptake a Wrist fracture was demonstrated. Diffuse uptake was thought to be indicative of ligamentous damage or reflex sympathetic dystrophy. Early scintigraphy was found to be a sensitive, reliable and cost-effective examination in cases of suspected significant Wrist Injury. Journal of Hand Surgery (British and European Volume, 1994) 19B: 114-117 Technetium 99 skeletal scintigraphy (bone scan) has been shown to be of value in doubtful cases of scaphoi
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experience of the early use of technetium 99 bone scintigraphy in Wrist Injury
Journal of Hand Surgery (European Volume), 1994Co-Authors: D. J. Shewring, R. Savage, G. ThomasAbstract:Abstract In a retrospective study, patients with suspected scaphoid fracture had an average of three sets of scaphoid radiographs prior to scintigraphy. Scans were performed an average of 3 months after Injury and many were inconclusive because of disuse changes. A prospective analysis of early scintigraphy in 35 cases over 18 months was carried out. Scans were performed at an average of 15.5 days after Injury in selected cases. Patients had an average of 1.28 sets of negative radiographs prior to scanning. There were no false negative scans and in 13 with focal uptake a Wrist fracture was demonstrated. Diffuse uptake was thought to be indicative of ligamentous damage or reflex sympathetic dystrophy. Early scintigraphy was found to be a sensitive, reliable and cost-effective examination in cases of suspected significant Wrist Injury.
A H Broekhuizen - One of the best experts on this subject based on the ideXlab platform.
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magnetic resonance imaging versus bone scintigraphy in suspected scaphoid fracture
European Journal of Nuclear Medicine and Molecular Imaging, 1996Co-Authors: M Tielvan M C Buul, W Roolker, B Verbeeten, A H BroekhuizenAbstract:Magnetic resonance imaging (MRI) has become increasingly useful in the evaluation of musculoskeletal problems, including those of the Wrist. In patients with a Wrist Injury, MRI is used mainly to assess vascularity of scaphoid non-union. However, the use of MRI in patients in the acute phase following carpal Injury is not common. Three-phase bone scintigraphy is routinely performed from at least 72 h after Injury in patients with suspected scaphoid fracture and negative initial radiographs. We evaluated MRI in this patient group. The bone scan was used as the reference method. Nineteen patients were included. Bone scintigraphy was performed in all 19 patients, but MRI could be obtained in only 16 (in three patients, MRI was stopped owing to claustrophobia). In five patients, MRI confirmed a scintigraphically suspected scaphoid fracture. In one patient, a perilunar luxation, without a fracture, was seen on MRI, while bone scintigraphy showed a hot spot in the region of the lunate bone, suspected for fracture. This was confirmed by surgery. In two patients, a hot spot in the scaphoid region was suspected for scaphoid fracture, and immobilization and employed for a period of 12 weeks. MRI was negative in both cases; in one of them a scaphoid fracture was retrospectively proven on the initial X-ray series. In another two patients, a hot spot in the region of MCP I was found with a negative MRI. In both, the therapy was adjusted. In the remaining six patients, both modalities were negative. We conclude that in the diagnostic management of patients with suspected scaphoid fracture and negative initial radiographs, the use of MRI may be promising, but is not superior to three-phase bone scintigraphy.
