A comparison of two non-invasive methods for measuring scapular orientation in functional positions |
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| Affiliation: | 1. Biomechanics and Movement Science Program, University of Delaware, Newark, DE, USA;2. Kinesiology and Applied Physiology Department, University of Delaware, Newark, DE, USA;3. University of Pittsburgh Medical Center Hamot, Erie, PA, USA;1. Department of Physical Therapy & Human Movement Sciences, Northwestern University, 645 N. Michigan Ave, Suite 1100, Chicago, IL 60611, USA;2. Mountaintop Physical Therapy and Wellness Center, 1794 Olympic Parkway, Suite 140, Park City, UT 84098, USA;3. Physical Therapy Department, Brigham and Women''s Faulkner Hospital, 1153 Centre Street, Boston, MA 02130, USA;1. School and Graduate Institute of Physical Therapy, College of Medicine, National Taiwan University, 100 Taipei, Taiwan;2. Department of Mechanical Engineering, College of Engineering, National Taiwan University, 100 Taipei, Taiwan;3. Division of Physical Therapy, Department of Physical Medicine and Rehabilitation, National Taiwan University Hospital, Taiwan;1. University Hospital Carl Gustav Carus Dresden, Center for Evidence-Based Healthcare, Fetscherstr. 74, 01307 Dresden, Germany;2. University Hospital Carl Gustav Carus Dresden, Centre for Orthopaedics and Trauma Surgery, Fetscherstr. 74, 01307 Dresden, Germany;3. Orthopaedic Surgery Center Tuebingen, Division for Shoulder and Elbow Surgery, 134 Wilhelm Street, 72074 Tuebingen, Germany;1. University of São Paulo, Ribeirão Preto Medical School, Department of Health Sciences, Ribeirão Preto, SP, Brazil;2. Universidade Federal de Minas Gerais, School of Physical Education, Physical Therapy and Occupational Therapy, Department of Physical Therapy, BH, Brazil |
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| Abstract: | Identification of scapular dyskinesis and evaluation of interventions depend on the ability to properly measure scapulothoracic (ST) motion. The most widely used measurement approach is the acromion marker cluster (AMC), which can yield large errors in extreme humeral elevation and can be inaccurate in children and patient populations. Recently, an individualized regression approach has been proposed as an alternative to the AMC. This technique utilizes the relationship between ST orientation, humerothoracic orientation and acromion process position derived from calibration positions to predict dynamic ST orientations from humerothoracic and acromion process measures during motion. These individualized regressions demonstrated promising results for healthy adults; however, this method had not yet been compared to the more conventional AMC. This study compared ST orientation estimates by the AMC and regression approaches to static ST angles determined by surface markers placed on palpated landmarks in typically developing adolescents performing functional tasks. Both approaches produced errors within the range reported in the literature for skin-based scapular measurement techniques. The performance of the regression approach suffered when applied to positions outside of the range of motion in the set of calibration positions. The AMC significantly underestimated ST internal rotation across all positions and overestimated posterior tilt in some positions. Overall, root mean square errors for the regression approach were smaller than the AMC for every position across all axes of ST motion. Accordingly, we recommend the regression approach as a suitable technique for measuring ST kinematics in functional motion. |
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| Keywords: | Shoulder Scapula Kinematics Measurement Cluster Regression Adolescent |
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