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Anthony A. Schepsis, MD
Next
 Patellar
instability is defined as abnormal, clinically
symptomatic, lateral or, in rare cases,
medial translation of the patella out of
the trochlear groove.
Instability includes dislocations
(figure right, click image to enlarge)
as well as subluxations, both of which can
be either traumatic or atraumatic.
Etiology
Etiology plays an important role in determining
whether surgery is indicated, and if so,
which operation is best.
For example, a congruent joint
with traumatic onset will most likely need
attention to the medial patellofemoral ligament
(figure right, click image to enlarge).
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