Establishing the Preliminary Utility of a Novel Pediatric Manual Mobile Standing Wheelchair

The primary outcome measure for this aim is user performance on a modified Wheelchair Skills Test (mWST) under three test conditions: PedMMSWC in the seated position, PedMMSWC in the standing position, and the individuals' daily wheelchair.

The investigators hypothesize that performance on the mWST in the PedMMSWC will not be clinically inferior to performance in individuals' daily wheelchairs.

Participants will perform a 100-meter roll test in the PedMMSWC (in seated and standing) and their daily wheelchair (dWC). This test is originally described in the WST Version 4.1 and measures how quickly (meters per second) participants can cover 100 meters in their wheelchair over hard, flat, level ground. Participants will perform the test once in each device condition (PedMMSWC-Seated, PedMMSWC-Standing, dWC), rate their perceived exertion, and speed following each test.

Participants will perform a 100-meter roll test in the PedMMSWC (in seated and standing) and their daily wheelchair (dWC). This test measures how much effort (percieved exertion) participants use to cover 100 meters in their wheelchair over hard, flat, level ground. Participants will perform the test once in each device condition (PedMMSWC-Seated, PedMMSWC-Standing, dWC) and rate their perceived exertion.

Participants will be measured with a pressure mapping device for peak pressure (mm/hg) in the PedMMSWC sitting, PedMMSWC standing, and the Easy Stand Device on interfacing surfaces.

Participants will be measured with a pressure mapping device for coefficient of variation in the PedMMSWC sitting, PedMMSWC standing, and the Easy Stand Device on interfacing surfaces.

To capture baseline satisfaction with individuals' primary wheelchair, each participant and their caregiver will collaboratively complete the FMA-FC outcome measure, which has been specifically designed and validated for pediatric use.

Participants will complete a course in the PedMMSWC and their dWC designed to simulate typical activities in home, school, and community environments. In each of these environments, participants will engage in a series of structured activities tailored to their developmental level. While using the PedMMSWC, participants will also complete a 'free play' period during which they will be encouraged to explore and spontaneously interact with the space. Individuals will have free choice to move between seated and standing positions in the PedMMSWC for all tasks and play. Outcomes: qualitative and coded interview data, why and how often sit-to-stand transitions occur, the time spent standing, and therapist score task completion and safety on a 4-point scale.

The SUS is a validated, 10-item quantitative scale used to measure the usability of an interactive system. Participants and their caregivers will complete the SUS in collaboration.

Using body motion analysis, investigators will record and analyze sit-to-stand transitions in a standing frame and the PedMMSWC wheelchair. Measuring three dimensional rotation of the thigh, shank, torso segments relative to the wheelchair during sit to stand transitions. during sit-to-stand transitions.

Using body motion analysis, investigators will record and analyze sit-to-stand transitions in a standing frame and the PedMMSWC wheelchair. Measuring the offset and translation (mm) of the body segments (trunk and thigh) relative to the chair or standing frame during sit-to-stand transitions.

Using body motion analysis, investigators will record and analyze sit-to-stand transitions in a standing frame and the PedMMSWC wheelchair. Measuring time-to-stand (seconds), time-to-sit (seconds) in the chair or standing frame during sit-to-stand transitions.