Back height below the inferior angle of the scapula indicates which of the following?

• A. Removable back insert
• B. Back height below inferior angle of scapula
• C. Planar seat
• D. Bevel front edge of seat

Answer: (B)

Back height relative to the inferior angle of the scapula shows how much trunk support the backrest provides versus how much scapular movement is allowed. When the back height sits below the inferior angle, the backrest doesn’t press against the upper back near the scapula, freeing the scapula to move and the shoulder to reach, which is important for tasks like propulsion or reaching when the user has good trunk control. This placement prioritizes arm mobility over maximal trunk stabilization. The other options describe features not directly about scapular clearance or arm movement—removable back inserts alter adjustability, planar seat refers to the seat surface, and beveling the front edge of the seat relates to edge shaping—so they don’t indicate the scapular clearance provided by back height.