Abstract

This literature review article examines the clinical relevance of various amounts of leg length discrepancies (LLD) in humans, followed by a review of the validity and reliability of various LLD measurement methods. Depending on the activity level and the type of effects looked at, LLDs of > 5 mm and ≥ 10 mm negatively impact the spine and lower extremities. The x-ray measurements of relative femoral head or iliac crest height are valid measures of LLD, while the reliability of palpating and visually estimating relative iliac crest height is questionable. In absence of imaging techniques, the development of a more reliable clinical method of LLD measurement is warranted.

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