Articular cartilage does not repair.

However, if your problem is a retropatellar syndrome (maybe due to an excessive genu valgum or a flat feet or a combination of the two), then possibly strengthening and stretching of quadriceps (mainly the vastus medialis), hamstring and calves should be benificial. But of course this is true if the above is applicable on your case and it is obviously impossible to say from here


all the best