(1) Width of wheelchair seat: measure the distance between two hips or two strands when sitting down. After adding 5cm, there is a gap of 2.5cm on each side after sitting down. The seat is too narrow, it is difficult to get on and off the wheelchair, but the hips and thighs are compressed; the seat is too wide, it is not easy to sit firmly, the wheelchair is not easy to operate, the limbs are easy to fatigue, and it is also difficult to enter and exit the gate.

⑵ Wheelchair seat length: measure the horizontal distance between the rear hip and calf gastrocnemius muscle when sitting down, and reduce the measurement result by 6.5 cm. If the seat is too short, the weight will mainly fall on the ischium, which is easy to cause excessive local pressure. If the seat is too long, it will compress the popliteal fossa and affect the local blood circulation, and it is easy to irritate the skin. For patients with short thighs or hip and knee flexion contractures, it is better to use a short seat.