It usually takes 3-4 weeks to recover from a running injury to the soft tissues of the knee, depending on the location and extent of the injury. Running knee injuries are commonly associated with torn medial collateral ligaments, anterior cruciate ligament or meniscus injuries. Medial collateral ligament injuries are primarily painful swelling near the medial side of the knee. Minor medial collateral ligament injuries can be cured by topical medications applied to eliminate the swelling in about 3-6 weeks, while severe medial collateral ligament ruptures require surgery. Acute knee hematoma can occur with ACL injury, affecting joint movement and walking. Severe ACL injury or meniscus injury requires surgery, and simple sports can be resumed about 6 months after surgery, with a basic return to normal 1 year after surgery. Injuries to the knee that occur in running must be promptly seen by a hospital orthopedic surgeon to examine the site and extent of injury, promptly immobilize the affected limb, reduce joint activity, prevent secondary injury, and actively cooperate with treatment.