Which assessment would best identify a leg-length discrepancy contributing to functional scoliosis?

Which assessment would best identify a leg-length discrepancy contributing to functional scoliosis?

• A. Measure leg lengths
• B. Full spine X-ray
• C. MRI of lumbar spine
• D. Gait analysis

Answer: (A)

Measuring leg lengths directly is the most direct way to detect a discrepancy that could cause functional scoliosis. When one limb is shorter, the pelvis tilts, and the spine compensates with a curving pattern that appears scoliosis-like but is not a fixed spinal deformity. A precise measurement of limb lengths—done clinically and, if needed, confirmed radiographically—identifies whether a true discrepancy exists and guides treatment, such as using a heel lift or orthotics. Other approaches can show the spine’s alignment or compensations, but they don’t efficiently establish whether the leg-length difference is contributing to the curve.

Measuring leg lengths directly is the most direct way to detect a discrepancy that could cause functional scoliosis. When one limb is shorter, the pelvis tilts, and the spine compensates with a curving pattern that appears scoliosis-like but is not a fixed spinal deformity. A precise measurement of limb lengths—done clinically and, if needed, confirmed radiographically—identifies whether a true discrepancy exists and guides treatment, such as using a heel lift or orthotics. Other approaches can show the spine’s alignment or compensations, but they don’t efficiently establish whether the leg-length difference is contributing to the curve.