Which landmark is used for back height measurement?

Which landmark is used for back height measurement?

• A. Greater trochanter
• B. Olecranon
• C. Popliteal fossa
• D. Axilla floor

Answer: (D)

Back height is about how high the back support should rise to provide stable trunk support without impeding movement of the shoulders and arms. The axilla floor—the crease beneath the armpit—is the standard landmark used for this measurement because it marks the level where the backrest should terminate to support the thoracic spine while leaving room for the shoulder girdle to move freely. Measuring from the seat surface up to the axilla floor gives a reproducible, functional back height that fits most adults. Other landmarks listed are used for different measurements: the greater trochanter relates to hip alignment and seat depth, the olecranon to elbow height, and the popliteal fossa to knee/seat relationships.

Back height is about how high the back support should rise to provide stable trunk support without impeding movement of the shoulders and arms. The axilla floor—the crease beneath the armpit—is the standard landmark used for this measurement because it marks the level where the backrest should terminate to support the thoracic spine while leaving room for the shoulder girdle to move freely. Measuring from the seat surface up to the axilla floor gives a reproducible, functional back height that fits most adults. Other landmarks listed are used for different measurements: the greater trochanter relates to hip alignment and seat depth, the olecranon to elbow height, and the popliteal fossa to knee/seat relationships.