Motion Patterns in ADLs After Total Shoulder Arthroplasty
Motion Patterns in ADLs After Total Shoulder Arthroplasty
Since the Neer prosthesis was developed in the 1950s, shoulder arthroplasty has advanced considerably. Today, total shoulder arthroplasty (TSA) can significantly improve function in osteoarthritic shoulders, but a patient's ability to perform activities of daily living (ADLs) can still remain impaired. Motion analysis of the shoulder is challenging owing to the high range of motion (ROM) of the shoulder. As the clinical gold standard, shoulder ROM is measured by using a goniometer and evaluated by scores such as the Constant score (CS). Measuring shoulder ROM with a goniometer gives inaccuracies of about 5° to 10°. Furthermore, according to goniometric measurement, it is difficult to distinguish shoulder joint motion from compensatory motion in the trunk and spine. Therefore, a novel model (HUX), as described by Rettig et al., was developed. The HUX model determines the shoulder joint center from the motion data and is dynamically able to capture movement in this calculated shoulder joint center in relation to the torso. With the HUX model, 3D motion can be analyzed in detail after TSA. There is sparse data about the impact of TSA on motion in ADL. Therefore, the purpose of this study was to examine whether TSA is able to restore normal ROM in ADLs in patients with degenerative osteoarthritis of the glenohumeral joint over the course of 3 years.
Background
Since the Neer prosthesis was developed in the 1950s, shoulder arthroplasty has advanced considerably. Today, total shoulder arthroplasty (TSA) can significantly improve function in osteoarthritic shoulders, but a patient's ability to perform activities of daily living (ADLs) can still remain impaired. Motion analysis of the shoulder is challenging owing to the high range of motion (ROM) of the shoulder. As the clinical gold standard, shoulder ROM is measured by using a goniometer and evaluated by scores such as the Constant score (CS). Measuring shoulder ROM with a goniometer gives inaccuracies of about 5° to 10°. Furthermore, according to goniometric measurement, it is difficult to distinguish shoulder joint motion from compensatory motion in the trunk and spine. Therefore, a novel model (HUX), as described by Rettig et al., was developed. The HUX model determines the shoulder joint center from the motion data and is dynamically able to capture movement in this calculated shoulder joint center in relation to the torso. With the HUX model, 3D motion can be analyzed in detail after TSA. There is sparse data about the impact of TSA on motion in ADL. Therefore, the purpose of this study was to examine whether TSA is able to restore normal ROM in ADLs in patients with degenerative osteoarthritis of the glenohumeral joint over the course of 3 years.
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