Arthroscopic knee surg. Aug. 9, after I took up jogging, sudden pain. Dr saw arthritis, shaved cartilage behind knee. Still hurts to walk.?

Call ur Dr. Ask the surgeon whether or not thy expect the pain to persist temporarily and for how long. Get a follow up if not get second opinion.
Can't cure arthritis. Unfortunately we can't cure arthritis. You should consider activity modification--non impact exercise (ie riding a bike, swimming, elliptical). Stretching and proper strengthening of quads, hamstrings and core muscles may be helpful. Antiinflamatories intermittently may help too; if pain persists followupnwith orthopedist to discuss possibility of injections.