In patellofemoral instabilty the patella (kneecap) changes its relationship to the groove of the femur bone (thighbone) and may partially or fully de-rail.

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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.

Patellar instability and dislocation

I am focusing this discussion primarily on patients who are patellar dislocators, although I touch on procedures that also relate to people who have patellar instability and are subluxators but who do not necessarily experience full-blown dislocation.

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