This is when the kneecap (patella) comes right out of the groove in the thighbone (femoral groove) in which it normally rides.

It is most common in young people (16-20 years) and most frequent in the female sex.

-

An overview by Dr Lars Blond.

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

Discussing how the anatomy can affect the tendency to dislocate the patella.

What are the common kneecap problems?

A quick overview of kneecap problems to help you with your research.

-