American Orthopaedic

that's a serious injury I had in football, a guy fell on my knees near the thigh while the leg was twisted, I feel the pain sharp knife around my knee every time I try to bend the leg, as if all my ligaments were torn, and more I feel my leg is not as well connected to the thigh of the healthy leg, as if she could easily dislocated knee, my knee is oddly only somewhat swollen

In my opinion, your injury will require the services of an orthopedic surgeon. Looks like you have an ACL tear damage at least and perhaps more serious. The knee is unstable and you need immediate care. In the meantime, you need to stay away from him, not weight bearing. Wrap it in a bandage for support and apply ice and elevate with pillows under the entire length of the leg. A sports medicine doc can help with prevention exercises, but if you need surgery, orthopedic surgery is one doc. Good Luck

do not go by the authorities --- ask around to get advice
try physical therapy before any type of surgery