When designing seating for a child with motor impairment, what is the key principle to optimize function and prevent secondary musculoskeletal issues?

• A. Emphasize flexible posture and minimal supports
• B. Use narrow base of support to encourage mobility
• C. Provide stable trunk and pelvic alignment with appropriate supports and a supportive base of support
• D. Focus on upper limb support only

Answer: (C)

Maintaining a stable trunk and pelvis with appropriate supports and a solid base of support is the foundation for functional seating in a child with motor impairment. When the trunk and pelvis are well-aligned, the body can use the arms more effectively for reaching, manipulating objects, and interacting with the environment, while also supporting better head and neck control and respiratory efficiency. This alignment helps distribute weight evenly, reduces abnormal joint stresses and the risk of scoliosis or contractures, and lowers energy expenditure by minimizing the need for compensatory postures. A well-designed seating system uses back and lateral supports, a stable pelvic base (often with a seat that fits well and, if needed, a pelvic strap or contoured cushion), and proper foot positioning to create that solid base. Focusing on the trunk and pelvis with the appropriate supports ultimately optimizes function and helps prevent secondary musculoskeletal issues, rather than prioritizing only the arms or restricting the base of support.