The patient develops knee interlock, which is an idiosyncratic symptom of the patient’s meniscal knee injury. If this occurs, the patient will first feel significant pain in the knee area, positive local pressure pain, and a positive McKinsey’s sign on examination of the knee. Secondly, if the patient has interlocked knee, the patient will feel a kind of stuck knee joint and will not be able to flex and extend the knee joint. If the knee is interlocked, the patient should be seen in a timely manner, and the patient will return to normal after the doctor unlocks and resets the knee. However, the knee joint should be treated with reduced activity, braking, physiotherapy, microwave therapy, and topical ointment to improve local blood circulation, so that the damaged meniscus can be recovered as soon as possible. In addition, the patient can be instructed to take oral blood-boosting drugs, such as oral bruising pills and bone bruising spirit, which can help the recovery of knee and meniscus injuries.