My mri says " chronic changes of the medial meniscus with complex tearing of the posterior horn noted. lateral meniscus in intact". will surgery help?

Yes: If u are having medial( inside) knee pain w/ swelling and or " catching " and are in good health arthroscopic meniscal repair vs. Resection can be helpful .If you are overweight and have significant associated knee arthritis your chances of improving after the " scope" are lessened. See a board certified ors who is proficient @ knee arthroscopy. Good luck!