Something Doesn’t Look Right: Recognizing and Managing Limb-Length Discrepancy

Abstract

Leg length discrepancy (LLD) is a frequently encountered yet often underrecognized musculoskeletal condition in children. Minor differences in leg length are common and typically benign; however, more significant discrepancies may reflect underlying congenital, developmental, or acquired pathology. Because many children adapt well, these discrepancies can remain unnoticed until gait changes, pain, or functional limitations appear. Early recognition is essential, as management depends on the child’s remaining growth and the underlying cause. Epidemiologic studies suggest that up to 90% of children have some degree of asymmetry, but clinically significant LLD is rare. Despite this, many pediatricians report uncertainty about how to distinguish true from apparent discrepancies and when to refer for orthopedic evaluation. The optimal approach involves routine screening during well-child visits, accurate physical examination, and timely referral when progressive or symptomatic differences are detected. This review summarizes the causes, evaluation, and management of pediatric LLD and provides practical guidance to help pediatricians recognize red flags, interpret imaging, and counsel families effectively.