Knee stiffness without bending may be due to patella fracture, knee pathology, etc. Recovery is not something that can be generalized and the exact situation is more related to the cause. Recovery time usually ranges from 3 months to 6 months, or even longer. If the symptoms are caused by a long period of external fixation with limited movement, the recovery time may be around 3 months with active exercise and a strong physical condition, or even longer. If it is caused by patellar fracture, after active cut and reset patellar fixation surgery, when the postoperative swelling decreases and after effective postoperative recovery, the condition is recovered, the symptom of stiffness of the knee joint without bending can gradually return to normal after 3 months. If it is due to knee joint lesions, such as meniscus injury symptoms, can be minimally invasive treatment through the knee arthroscopy, when the symptoms are recovered, the symptoms of stiffness of the knee joint without bending will be recovered in about 3 to 6 months. When the body has an adverse reaction, you should go to the hospital in time for diagnosis and early targeted treatment.