CMC Wheelchair Seating & Positioning 2

Question 1

Which measurement is most critical when determining appropriate seat depth for a wheelchair user?

Accepted Answer

Hip-to-popliteal length

Answer

Seat depth is based on hip-to-popliteal length to ensure proper thigh support without impeding circulation behind the knee.

Question 2

A client presents with a posterior pelvic tilt and sacral sitting posture. Which intervention is MOST appropriate as a first-line seating solution?

Accepted Answer

Solid seat insert with anterior tilt

Answer

A solid seat insert with slight anterior tilt helps restore neutral pelvic alignment and reduces sacral sitting.

Question 3

What is the primary purpose of a lateral trunk support in a wheelchair seating system?

Accepted Answer

Prevent lateral trunk collapse and maintain midline orientation

Answer

Lateral trunk supports prevent the trunk from collapsing sideways and help the user maintain an upright midline position.

Question 4

A user with spastic diplegia tends to scissor their legs together in the wheelchair. Which positioning device best addresses this?

Accepted Answer

Medial knee block (abductor)

Answer

A medial knee block or abductor pommel positions between the knees to prevent hip adduction and the scissoring pattern.

Question 5

When measuring seat-to-floor height for a manual wheelchair user who self-propels with their feet, what is the primary consideration?

Accepted Answer

Feet must reach the floor flat while maintaining slight hip flexion

Answer

Foot propellers need a lower seat height so both feet contact the floor fully, enabling efficient and safe propulsion.

(CMC) Certified Mobility Consultant Practice Test