Increased Seat Dump Angle in a Manual Wheelchair Is Associated With Changes in Thoracolumbar Lordosis and Scapular Kinematics During Propulsion.
Beth A Cloud, Kristin D Zhao, Arin M Ellingson and 3 others
PMID 28322758WHAT IT FOUND
A 14° seat dump angle changed spinal posture and scapular motion during manual wheelchair propulsion.
Lordosis decreased, scapular internal rotation increased at push start and mid push, and glenohumeral motion did not change.
Key findings
01Compared with a 0° seat dump angle, the 14° condition produced significantly less thoracolumbar lordosis at all propulsion events in the full group.
02The 14° condition produced significantly higher scapulothoracic internal rotation and larger upward/downward rotation values at start of push and mid push.
03No significant differences were found between seating conditions for kyphosis or for any glenohumeral rotation.
STILL TO COME
How it was doneWhat they foundWhat it means for PTs
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What it does not show
The study measured short-term propulsion after the seating change, so it does not show how posture or shoulder motion may change over weeks or months. The sample was small, and one participant did not complete propulsion in both seating conditions. The study did not measure the pelvis, forearm, hand, or timing variables, so it cannot explain how those segments may have adapted. The outcomes were kinematic changes, not clinical outcomes such as shoulder pain, injury, or function.
Declared interests
The authors report no relevant conflicts of interest. The supplied metadata notes NIH extramural and non-U.S. government research support, but the text does not describe a funder role.
The easy way to misread this
Do not conclude that a 14° seat dump angle improves or worsens shoulder health. The study measured short-term kinematics, not pain or injury, and glenohumeral motion did not change.