OBJECTIVE: To estimate the differences in glenohumeral contact forces and shoulder muscle forces between able-bodied subjects and subjects with paraplegia and tetraplegia during wheelchair-related activities of daily living (ADLs).
DESIGN: Kinematics and external forces were measured during wheelchair ADLs (level propulsion, weight-relief lifting, reaching) and processed by using an inverse dynamics 3-dimensional biomechanical model.
SETTING: Biomechanics laboratory.
PARTICIPANTS: Five able-bodied subjects, 8 subjects with paraplegia, and 4 subjects with tetraplegia (N = 17).
INTERVENTIONS: Not applicable.
MAIN OUTCOME MEASURES: Glenohumeral contact forces and shoulder muscle forces.
RESULTS: Peak contact forces were significantly higher for weight-relief lifting compared with reaching and level propulsion (P < .001). High relative muscle force of the rotator cuff was seen, apparently needed to stabilize the joint. For weight-relief lifting, total relative muscle force was significantly higher for the tetraplegia group than for the able-bodied group (P = .022).
CONCLUSIONS: Glenohumeral contact forces were significantly higher for weight-relief lifting and highest over the 3 tasks for the tetraplegia group. Without taking paralysis into account, more muscle force was estimated for the subjects with tetraplegia during weight-relief lifting.
|Number of pages||7|
|Journal||Archives of Physical Medicine and Rehabilitation|
|Publication status||Published - Jul 2005|