What is the normal range for normal lumbar spine trunk forward flexion?

What is the normal range for normal lumbar spine trunk forward flexion?

• A. Angle between trunk and thigh is 60°.
• B. Distance from hip to floor is 30 cm.
• C. Lumbar rotation should be 30°.
• D. T12-S1 distance should increase 7-8 cm.

Answer: (D)

Forward flexion of the lumbar spine is quantified by how much the distance between the T12 and S1 spinous processes increases as you bend forward. In a typical adult, this distance grows by about 7 to 8 cm, reflecting the lumbar spine’s contribution to the motion (with the pelvis and hips also playing a role). This measurement specifically isolates lumbar motion better than simply looking at trunk-to-floor distance or hip angle. The other options describe hip flexion angle, total trunk-to-floor distance, or lumbar rotation, which do not measure lumbar forward flexion in the same standardized way.

Forward flexion of the lumbar spine is quantified by how much the distance between the T12 and S1 spinous processes increases as you bend forward. In a typical adult, this distance grows by about 7 to 8 cm, reflecting the lumbar spine’s contribution to the motion (with the pelvis and hips also playing a role). This measurement specifically isolates lumbar motion better than simply looking at trunk-to-floor distance or hip angle. The other options describe hip flexion angle, total trunk-to-floor distance, or lumbar rotation, which do not measure lumbar forward flexion in the same standardized way.