Unequal leg length

Unequal leg length
Unequal leg length
	A girl with a congenital, structural difference in leg lengths walking in a clinic.
Specialty	Rheumatology

Unequal leg length (also termed leg length inequality, LLI or leg length discrepancy, LLD) is often a disabling condition where the legs are either different lengths (structurally), or appear to be different lengths, because of misalignment (functionally).

Unequal leg length with a small degree of difference is very common; small inequalities in leg length may affect 40%–70% of the human population. It has been estimated that at least 0.1% of the population have a difference greater than 20 mm (0.79 in). As of June 2024^[update], that is approximately 8.1 million people total in the human population.^[1]

^ Gurney, Burke (2002-04-01). "Leg length discrepancy". Gait & Posture. 15 (2): 195–206. doi:10.1016/S0966-6362(01)00148-5. ISSN 0966-6362. PMID 11869914. LLD is a relatively common problem found in as many as 40 [1] to 70% [2] of the population. In a retrospective study, it was found that LLD of greater than 20 mm affects at least one in every 1000 people [3].

[1] Gurney, Burke (2002-04-01). "Leg length discrepancy". Gait & Posture. 15 (2): 195–206. doi:10.1016/S0966-6362(01)00148-5. ISSN 0966-6362. PMID 11869914. LLD is a relatively common problem found in as many as 40 [1] to 70% [2] of the population. In a retrospective study, it was found that LLD of greater than 20 mm affects at least one in every 1000 people [3].

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