Assertion: patella's surface | /r/HasProperty | about 12 cm2
Facets:
value: in the adult
type: OTHER
Source sentences:
text: In the adult the articular surface is about 12 cm2 (1.9 sq in) and covered by cartilage, which can reach a maximal thickness of 6 mm (0.24 in) in the centre at about 30 years of age.