6/11/2023 0 Comments Look over the shoulder action poseIn the bilateral arm abduction movements the volunteers perform a common and specific pattern in clavicula-thoracic and gleno-humeral motion with maximum shoulder angles of 32° elevation, 5° depression and 45° protraction, respectively, whereas retraction is hardly reached. Lesser agreement is found for shoulder pro-/retraction with systematic deviations of up to 6°. ![]() With mean differences of less than 2°, the proposed anatomical zero position results in good agreement between shoulder elevation/depression angles determined by 3D marker tracking and by universal goniometry in static positions. Similarly a subject with gleno-humeral osteoarthritis is monitored for demonstrating the feasibility of the method and to illustrate possible shoulder dysfunction effects. Repetitive bilateral arm abduction movements of at least 150° range of motion are monitored. Static shoulder positions are documented simultaneously by 3D marker tracking and universal goniometry in 8 young and healthy volunteers. An anatomical zero position of shoulder pose is proposed to determine absolute angles according to the Neutral-0-Method as used in orthopedic context. The clinical inspection of bilateral arm abduction for assessing shoulder dysfunction is performed with a marker based 3D optical measurement method. Marker-based motion capture may not resemble these results due to differing angle definitions. ![]() ![]() Clinically, the outcome can be assessed by universal goniometry. ![]() Surgical interventions at the shoulder may alter function of the shoulder complex.
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