UAN: 217 Article type:--SymptomsAlthough any force from the outside may sprain the medial collateral, the usual cause in runners is a twisting of the knee while the foot is stuck in a pothole or if the foot has suddenly slipped on a greasy surface
. It is realised now that a meniscus tear frequently occurs in conjunction with other damage to the collateral or cruciate ligaments, so the knee may swell with an effusion of clear serum and/or blood, and a tear which twists on itself can cause the joint to lock
