The patellofemoral joint is the area of contact of the undersurface of the patella (kneecap) with the femur bone.

The patellofemoral joint is not a fixed articulation, but rather it is a groove along which the patella glides.
Compartments
The patellofemoral joint is considered to be a 'compartment', because disease may affect just this one part of the knee articulation. The other two compartments are the two tibiofemoral compartments.
Synonyms:
PF joint
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CLINICAL PUBLICATIONS
Clinical features of symptomatic patellofemoral joint osteoarthritis. Peat G, Duncan RC, Wood LRJ, Thomas E and Muller S. Arthritis Res Ther. 2012; 14(2): R63.