A patient is referred for wheelchair dimensions. Sitting measurements: 16 inches across widest hips; 18 inches from posterior buttocks to popliteal crease. Which wheelchair dimensions are BEST?

A patient is referred for wheelchair dimensions. Sitting measurements: 16 inches across widest hips; 18 inches from posterior buttocks to popliteal crease. Which wheelchair dimensions are BEST?

• A. Seat width and seat depth of 18 inches
• B. Seat width of 18 inches and seat depth of 16 inches
• C. Seat width and seat depth of 16 inches
• D. Seat width of 16 inches and seat depth of 18 inches

Answer: (B)

Seat width should accommodate the widest part of the hips with some clearance, while seat depth should support from the buttocks to just behind the knee with a small reduction to avoid pressure behind the knee. In this patient, the widest hip measurement is 16 inches, so about 18 inches of seat width provides comfortable clearance without making the chair too wide to propel or transfer. The distance from posterior buttocks to the popliteal crease is 18 inches; subtracting about 2 inches for clearance gives a 16-inch seat depth, which supports the thighs without pressing at the back of the knee and allows space for the footrests. Therefore, the best combination is a seat width of 18 inches and a seat depth of 16 inches. Options with a narrower width (16 inches) or with a deeper seat (18 inches) would be less appropriate because they could cause tissue compression or pressure behind the knee and affect positioning and function.

Seat width should accommodate the widest part of the hips with some clearance, while seat depth should support from the buttocks to just behind the knee with a small reduction to avoid pressure behind the knee. In this patient, the widest hip measurement is 16 inches, so about 18 inches of seat width provides comfortable clearance without making the chair too wide to propel or transfer. The distance from posterior buttocks to the popliteal crease is 18 inches; subtracting about 2 inches for clearance gives a 16-inch seat depth, which supports the thighs without pressing at the back of the knee and allows space for the footrests. Therefore, the best combination is a seat width of 18 inches and a seat depth of 16 inches. Options with a narrower width (16 inches) or with a deeper seat (18 inches) would be less appropriate because they could cause tissue compression or pressure behind the knee and affect positioning and function.