Manual Wheelchair Configuration in Unilateral Upper- and Lower-Extremity Propulsion: A Randomized Crossover Study to Assess Effects of Rear Wheel Axle Position and Frame Type.

OBJECTIVE: To evaluate independence and exertion when using a lightweight wheelchair in comparison with ultra-lightweight wheelchairs (rigid and folding) for individuals with brain injury using a hemipropulsion technique. DESIGN: Randomized cross-over. SETTING: Rehabilitation hospital. PARTICIPANTS: Individuals diagnosed with brain injury resulting in hemiplegia using a hemipropulsion technique to mobilize in a manual wheelchair for at least 4 hours per day were recruited for this study. INTERVENTIONS: Eighteen participants were randomly assigned to complete skills and endurance testing in 3 different wheelchair configurations over a 3-week period: lightweight wheelchair; ultra-lightweight folding wheelchair; and ultra-lightweight rigid wheelchair. MAIN OUTCOME MEASURES: The primary outcome in this study was the percentage capacity score from the modified Wheelchair Skills Test 4.1. Secondary outcomes included the Wheelchair Propulsion Test, 100-m Push Test, heart rate, and rate of perceived exertion. RESULTS: Significant differences were found in the Wheelchair Skills Test (total score, low rolling resistance score, and the goal attainment score) favoring the ultra-lightweight wheelchairs over the lightweight wheelchair (P=.002, .001, and .016, respectively). Time to complete the 100-m push test was significantly faster for the ultra-lightweight rigid frame in comparison with the lightweight frame (P=.001; 30.89 seconds faster). Significance differences were not seen with the Wheelchair Propulsion Test measures across any of the wheelchair frames. Heart rate change and of perceived exertion were significantly lower for the ultra-lightweight rigid group in comparison with the lightweight group (P=.006 and .013, respectively). CONCLUSIONS: These data suggest that using an ultra-light weight wheelchair may lead to improved ability to complete wheelchair skills needed for successful mobility and a decrease in the actual and perceived physiological burden associated with propulsion in comparison to a lightweight wheelchair. A rigid frame may also enable faster mobility in comparison to a folding frame when hemi-propelling.

Wheelchair backs that support the spinal curves: Assessing postural and functional changes.

Objective: To compare outcomes using a wheelchair back designed to support the natural seated spinal curves versus an upholstered back that promotes posterior pelvic tilt and thoracolumbar kyphosis.Design: Cross-over intervention.Setting: Two free-standing spinal cord injury (SCI) model system hospitals.Participants: Fifty adults with motor complete SCI C6-T4, between the ages of 18-60 years who use a manual wheelchair for mobility were recruited from a convenience sample.Intervention: Each participant's wheelchair back support was removed and replaced by an upholstered back and a solid back in randomized order. Postural and functional outcomes, pain, and satisfaction were evaluated using each back.Outcome measures: Seated postural measurements included pelvic angle, spinal angle of kyphosis and linear measurement of spine. Functional outcomes included vertical forward reach, one stroke push, timed forward wheeling, ramp ascent and descent. Numerical pain rating and a satisfaction survey provided input pertaining to both backs.Results: The solid back demonstrated significance in seated postural measurements. Participants using the solid back trended to higher scores in functional outcome measures including vertical forward reach, one stroke push and timed ramp ascent. Participants reported increased satisfaction with comfort and stability with the solid back.Conclusions: This pilot study demonstrated that a wheelchair back, which supports the seated spinal curves improves upright posture, functional reach, and wheelchair propulsion skills. Further research is necessary to demonstrate statistical findings as well as to assess back height and lateral support.