Which statement best describes the impact of leg length discrepancy on spinal alignment and how it is clinically assessed?

• A. It can cause pelvic tilt and compensatory spinal curvature leading to pain; assess with standing alignment, palpation, and block testing
• B. It improves posture
• C. It only affects knees
• D. It has no relationship to spine

Answer: (A)

Leg length discrepancy creates asymmetrical loading through the pelvis, often causing a tilt of the pelvis and sacral imbalance. To keep the head level, the spine then develops compensatory curves, which can lead to low back pain, muscle strain, and altered spinal mechanics. Clinically, you assess this with standing alignment to look for uneven pelvis and spinal curves, palpation to detect pelvic tilt and asymmetries in landmarks such as the iliac crests and PSIS, and block testing by placing shims under the shorter leg to level the pelvis and observe changes in spinal posture and symptoms. If the blocks improve alignment and reduce pain, it supports the influence of leg length discrepancy on the spine. This condition does not simply improve posture, does not only affect the knees, and it does have a meaningful relationship with the spine.