I have a kissing contusion in the inferolateral patella and antherolateral trochlea with overlying articular cartilage defects. What is the treatment?

Varies. Varies somewhat based upon more exact nature of injury. Contusion simply is one way to say a "bruise". So, if you bruised an area that already had some arthritic loss of cartilage, the injury should improve simply with rest and possibly a brace. If the "cartilage loss" actually represents a displaced osteochondral fracture, then surgery is likely indicated to fix the fracture. .