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Scapular range of motion in a quasi-wheelchair push

Koontz, AM and Cooper, RA and Boninger, ML and Souza, AL and Fay, BT (2004) Scapular range of motion in a quasi-wheelchair push. International Journal of Industrial Ergonomics, 33 (3). 237 - 248. ISSN 0169-8141

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Descriptions of shoulder kinematics during wheelchair propulsion are limited to motions of the upper arm due to the difficulty of measuring scapular movement in vivo. Using a digitizing stylus, the three-dimensional positions of three anatomical landmarks on the scapula were recorded for 10 manual wheelchair users in six different statically held hand positions (-30°, -15°, 0°, 15°, 30°, 60°) on the pushrim. In each hand position, a motion analysis system recorded the coordinates of infrared markers on the arm and torso. Scapular, humeral, and torso angles were computed using an Euler angle decomposition method for each position relative to the torso. At the beginning of the push, the scapula was rotated slightly upward (1.5°), minimally protracted (15°), and maximally tipped forward (22°). In addition, the humerus was maximally extended, abducted and internally rotated. As subjects moved forward along the pushrim, the protraction angle increased while the forward tipping angle decreased. The humerus became increasingly more flexed as the push progressed with small changes observed in humeral abduction and internal rotation. A stepwise multiple regression analysis procedure (p<0.01) revealed that the torso, humeral flexion/extension and abduction angles are good predictors for estimating forward tipping and upward/downward rotation of the scapula. The regression equations enable researchers to estimate scapular orientation during propulsion which could provide further insight into specific biomechanical factors that lead to shoulder pathology.


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Item Type: Article
Status: Published
CreatorsEmailPitt UsernameORCID
Koontz, AMakoontz@pitt.eduAKOONTZ
Boninger, MLboninger@pitt.eduBONINGER
Souza, AL
Fay, BT
Centers: Other Centers, Institutes, Offices, or Units > Human Engineering Research Laboratories
Date: 1 January 2004
Date Type: Publication
Journal or Publication Title: International Journal of Industrial Ergonomics
Volume: 33
Number: 3
Page Range: 237 - 248
DOI or Unique Handle: 10.1016/j.ergon.2003.04.002
Schools and Programs: School of Health and Rehabilitation Sciences > Rehabilitation Science and Technology
Refereed: Yes
ISSN: 0169-8141
Date Deposited: 15 Oct 2012 14:18
Last Modified: 02 Feb 2019 16:56


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