Can you rehab a chondromalacia patella with a patellar cyst?

Yes - quad strength: The patella will track better and grind less if the quad muscles are rehabed well. The quad muscles form the patellar tendon, which stabilizes the patella. By strengthening these muscles, it can help the patella. Focus on exercises such as leg extensions, but go slow with low weight, focusing on the contraction and tracking.

Chondromalacia: Yes, chondromalacia with cyst means there is some cartilage damage present. Therapy can be helpful in strengthening the quads and helping the kneecap track in its groove better. Therapy doesn't make the cyst or chondromalacia go away but can be helpful for the pain.

Yes: Treatment consists of activity modification, ice, anti-inflammatory meds and therapy aimed at flexibility and strengthening, especially of your core. The patellar cyst may be a sign of a focal area of greater cartilage wear. I would still rec rehab. The cyst won't go away, but it should help the pain.