What is the normal ROM for lumbar spine trunk extension?

What is the normal ROM for lumbar spine trunk extension?

• A. 0-20 to 0-30°
• B. 0-10 to 0-20°
• C. 0-40 to 60°
• D. 0-0 to 10°

Answer: (A)

Lumbar extension moves are relatively limited because the structure and ligaments in the lower back restrict how far the spine can tilt backward. When you test isolated lumbar motion, you stabilize the pelvis and hips so the movement comes mainly from the lumbar region. In that context, a typical, normal range is about 20 to 30 degrees. So, a range around 20–30 degrees best matches what the lumbar spine can do on its own. Values much smaller aren’t representative of normal lumbar motion, while much larger ranges usually involve additional movement from the hips or the upper spine, not just the lumbar vertebrae.

Lumbar extension moves are relatively limited because the structure and ligaments in the lower back restrict how far the spine can tilt backward. When you test isolated lumbar motion, you stabilize the pelvis and hips so the movement comes mainly from the lumbar region. In that context, a typical, normal range is about 20 to 30 degrees.

So, a range around 20–30 degrees best matches what the lumbar spine can do on its own. Values much smaller aren’t representative of normal lumbar motion, while much larger ranges usually involve additional movement from the hips or the upper spine, not just the lumbar vertebrae.