Thoracolumbar extension ROM measurement requires which of the following?

• A. Position: Standing; Stabilize: Stabilize pelvis to limit Posterior pelvic tilting; Tape Measure: between spinous process of T1 and S2 vertebra; Procedure: measure distance between spinous processes in neutral. Ask Pt to extend and re-measure. Find the difference indicates ROM
• B. Position: Standing; Stabilize: Stabilize pelvis to limit Anterior pelvic tilting; Tape Measure: between spinous process of T1 and S2 vertebra; Procedure: measure distance between spinous processes in neutral. Ask Pt to extend and re-measure. Find the difference indicates ROM
• C. Position: Standing; Stabilize: Stabilize pelvis to limit Posterior pelvic tilting; Tape Measure: between spinous process of T1 and S2 vertebra; Procedure: measure distance between spinous processes in neutral. Ask Pt to flex and re-measure. Find the difference indicates ROM
• D. Position: Standing; Stabilize: Stabilize pelvis to limit Anterior pelvic tilting; Tape Measure: between spinous process of T1 and S2 vertebra; Procedure: measure distance between spinous processes in neutral. Ask Pt to flex and re-measure.

Answer: (A)

Isolating thoracolumbar extension requires preventing pelvic motion from skewing the measurement. In standing, you stabilize the pelvis to limit posterior tilt, then place a tape measure from the spinous process of T1 down to S2. First record the spine in a neutral posture, then have the patient extend the trunk and re-measure. The difference between the two distances reflects the thoracolumbar extension ROM. This approach specifically measures backward bending, not forward flexion, and the pelvic stabilization prevents compensations that would falsely alter the reading. Limiting anterior pelvic tilting would not consistently control the pelvic motion seen during extension, and measuring flexion would assess a different movement altogether.