Hi I Had Surgery On My Left Medial Mensicus About

hi i had surgery on my left medial mensicus about 6 months ago physical therepay was good after two months my dr said i was fine and strong enough and i was intill i tried soccer like my 5 months after surgory now, my knee doesnt hurt during games but it swells up after the game and i have to wear a knee brace/sleeve. i tried stretching everytime but i feel this really tight and burning feeeling in the baack of my knee idk if the cyst becasue there is no swelling in the back of knee. what is my problem adn what should ido