Everyone probably has a leg length difference, but in most it is probably clinically not detectable and unimportant. A few people have a large difference in leg length, that causes compensation and clinical symptoms. It has been shown that leg length differences do affect quality of life. Where a lot of debate arises is what is a clinically significant difference and when should it be treated. Just because someone has symptoms and a leg length difference does not mean that the difference caused the symptoms. Some have tried to argue that a few millimeters is clinically significant; others argue that a lot more is needed before it should be treated. There is no evidence and each person will need to be treated on their merits.

Within podiatry it has been suggested that the longer leg will cause a foot to pronate, but this foot pronation for a leg length difference as been dismissed as a myth.

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