These pictures below show the procedure of arthroscopic ACL reconstruction surgery of the knee. ACL injury of the knee, generally have a history of obvious trauma, and after the injury there will be obvious swelling and pain, but generally after treatment, rest, a week or two after the swelling and pain will disappear, as if the lesion has been well, but after a period of time (variable, may be a few months, may also be a few years) will begin to feel unhappy, in the process will be very easy to injury, such as easy to sprain, thigh muscles More or less atrophy of the thigh muscles, running does not follow the leg, up and down the stairs this leg some insufficient force, if an X-ray, the joint may have a “bone spur”. The cruciate ligament is responsible for stabilizing the joint, and its rupture will lead to joint instability, which will cause a series of problems mentioned above. These are the signs of a positive drawer test (not always detected in the acute phase because of painful muscle tension), a positive Lackman test, thigh muscle atrophy, etc.