He had meniscus surgery. Essentially, that's they cut away the damaged meniscus, chunks and flaps of which were getting into his joint and probably locking up. He will more than likely suffer from bone spurs soon, if not already, because of this trauma. He may be getting shots of Synvisc, or something more advanced, to provide temporary relief (a temporary meniscus essentially), but the damage in done. it is permanent and not going away. IMO.