Wiberg classified the patella based on its anatomic features. These features correlate with its functional stability.
Size of Medial Facet
Shape of Medical Facet
Type
equal to lateral facet
slightly concave
I
small
II
flat
II/III
slightly convex
III
very small
steeply sloped
IV
absent, with no central ridge
NA
V
where:
• Type V is also called a Jagerhut patella.
Stability
excellent
good
fair
suboptimal
poor
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Specialty: Surgery, orthopedic
