Wiberg classification (dictionarydefinition)

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This is a classification of patellar shape, which is simply used in describing patellae.

• Type I: the facets are concave, symmetrical and of equal size
• Type II: the medial facet is rather smaller than the lateral facet. The lateral facet is concave.
• Type III: the medial facet is markedly smaller than the lateral facet.