Subluxation is when the bones of a joint nearly leave their normal alignment, but then return to a normal position.

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The unstable patella - congenital or acquired?

Instability in the patella means that it jumps to the edge or out of the normal track in the femur in which it lies.

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An unstable patella needs careful evaluation, so that things are not made worse by inappropriate intervention. This eBook explains the logic of X-ray and other investigations.

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