The Knee Learning Resource
This happens in quite a few people and may never do any harm. However, at the higher end of the thigh bone the groove in which the patellar slides is much shallower than it is in the normal position, so people with patella alta are more likely to dislocate their kneecaps.
Patella alta is also seen in patellar tendon rupture.
See also Caton-Deschamps Index.
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