RIGHT KNEE PROBLEMS

ABOUT 1 1/2 YEARS AGO I HAD SURGERY FOR TEARING MY MEDIAL MANISCUS THE DOCTOR REMOVED A PIECE OF CARTLEGE AND I DID SOME REHAB. MY KNEE REALLY HAS NEVER RECOVERED I HAD I DRAINED TWICE JUST AFTER THE SURGERY AND EVER SINCE THEN IT HAS BEEN GIVING ME PROBLEMS LIKE SWELLING AND EXTREME STIFFNESS AND PAIN. THE DOCTOR DID TELL ME THAT I HAD A LITTLE ARTHRITIS IN THE KNEE, JUST RECENTLY I STARTED HAVING SEVERE PAIN IN MY KNEE ESPECIALLY WHEN I TRY TO EXTEND IT STRAIGHT OUT FROM THE BENT POSITION I PLAY SOFTBALL AND HAVE STOPPED PLAYING BASKETBALL I DO NOT REMEMBER HURTING THE KNEE OR ANYTHING BUT LAST NIGHT I COULD BARLEY WALK ON IT AND IT WAS EXTREMLY STIFF PLEASE LET ME KNOW WHAT YOU THINK THIS COULD BE AND IF I SHOULD SCHEDULE A APPOINTMENT. THANKS ROBERT