Wheelchair seat height: Measure the distance from the heel (or heel) to the popliteal fossa when sitting down, add 4cm, and place the board at least 5cm above the ground when placing the foot pedal. If the seat is too high, the wheelchair cannot enter the table; if the seat is too low, the ischium bears too much weight. Cushions For comfort and prevention of bedsores, seats should be placed on wheelchair chairs. Common cushions include foam rubber cushions (5-10cm thick) or gel cushions. To prevent the seat from sinking, place a 0.6cm thick plywood under the seat cushion. Back height: The higher the back, the more stable, and the lower the back, the greater the movement of the upper body and upper limbs. Low*back: Measure the distance from the sitting surface to the armpits (with one arm or two arms extended forward), and reduce this result by 10 cm. High*back: Measure the actual height from the sitting surface to the shoulder or back pillow.

Armrest height: When sitting down, the upper arm is vertical, the forearm is lying on the armrest, measure the height from the chair surface to the lower edge of the forearm, plus 2.5cm. Proper armrest height helps maintain correct body posture and balance, and allows upper limbs to be placed in a comfortable position. The armrest is too high, the upper arm is forced to lift, and it is susceptible to fatigue. If the armrest is too low, you need to lean forward to maintain balance, which is not only easy to fatigue, but also can affect breathing.