For patients with left knee lateral bone pain, there are the following possibilities: First, lateral collateral ligament inflammation, mainly due to the lateral collateral ligament is subjected to repeated pulling, will be in the fibular head area, that is, the lateral collateral ligament stopping point of the site of aseptic inflammation, caused by the left side of the knee lateral bone pain and pressure, and in squatting activities, the pain will be significantly increased. B. Bone degeneration and hyperplasia on the lateral side of the left knee, which will irritate the surrounding soft tissues and cause obvious pain and tenderness on the lateral side of the knee when the bone is hyperplastic. Third, see the left knee lateral bone injury, especially in the bump injury, also easily lead to the left knee lateral bone pain.