Patellar cartilage

Cartilago articularis patellae

SkeletalSkeletonLegLeft and right

View left in 3D View right in 3D

What it is
Thick hyaline cartilage on the back of the patella, divided by a vertical ridge into medial and lateral facets.
Function
Glides in the femoral trochlear groove as the knee bends.
Size
Up to 5 mm thick
Clinical note
Softening of this cartilage (chondromalacia patellae) causes pain on stairs.