Knee creaking when bending may be physiological, at this time you can run, but it may also be caused by meniscus injury or intra-articular free body and other factors, at this time you can not run.
1. Physiological rattling: when the liquid in the knee joint and the joint tissues impact each other, or when the gas in the joint is squeezed during flexion and extension, rattling sound may appear, generally there is no obvious pain and activity limitation and other symptoms, which does not need special treatment and does not affect running and other sports.
2. Meniscus injury: long-term extrusion or violent rotation of the knee joint can cause meniscus injury, at this time there can be swelling and pain in the knee joint, limited activities and bending the knee creaking and so on. At this time, it is necessary to stop the activities of the knee joint, bandage and immobilization, not to run and other sports.
3. Intra-articular free body: exfoliative osteochondritis, bone redundancy, etc. can cause free body in the knee joint, showing sudden sharp pain, swelling and creaking when bending the knee joint. At this time, you should not do sports such as running.
If the knee joint creaks and is accompanied by pain, you need to go to the hospital in time to do the relevant examination, identify the cause of the disease and then receive treatment to protect the knee joint to avoid aggravation of the condition.