Unequal leg length (also termed leg length inequality, LLI or leg length discrepancy, LLD)
Unequal leg length (also termed leg length inequality, LLI or leg length discrepancy, LLD) is where the legs are either different lengths or appear to be different lengths because of misalignment. The condition has been estimated to affect between 40% and 70% of the population, with at least 0.1% having a difference greater than 20 mm.
Main types of leg length inequalities:
Structural differences are caused by the legs themselves being measurably different in length, usually due to differences in the length of the femur in the thigh or the tibia and fibula bones in the lower leg. This may be a birth defect or it may occur after a broken leg, serious infection, or local damage to one of the growth plates in a leg.
More common, type is seen when the legs themselves are the same length, but due to neuromuscular injuries in the pelvis or Upper leg, one leg or hip is held higher and tighter than the other (hypertonicity in the musculature of the pelvis or leg). These unequally tightened muscles cause the legs to seem to be different lengths, even though careful measurement would show equal lengths of the actual leg. This is called leg length alignment asymmetry (LLAA) and can be seen while lying down.
People who have had a knee replacement, hip replacement or surgery to repair a severe injury such as a broken foot, broken knee, or a broken leg often suffer from unequal leg lengths post surgery and throughout the healing process which can take up to a few years after surgery!
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