Emergency often see such cases: in the dance or sports, the knee joint suddenly very painful, can not move, can not stand on the foot. 120 to the hospital, the doctor according to the appearance can be judged to be a patellar dislocation, simple lower limb hyperextension position to lift the patella can be reset. The patient felt very good at once, except for a little pain, no other discomfort. Or in the clinic can see such a case: the patella is always dislocated, the patient himself has experience, can be dislocated patella reset, but to the movement and life with the inconvenience, dislocation more often, the knee joint pain, and gradually aggravated, can not get better. Or after a traumatic impact, the patella will also be dislocated. But the knee joint will be very painful and there is obvious swelling. These are the common types of patellar dislocation, corresponding to acute patellar dislocation, recurrent patellar dislocation, and post-traumatic patellar dislocation (the acute kind). The question is, do all these patients need surgery? In the first case, the first occurrence, with no history of significant trauma (mainly impingement), can be considered to be treated conservatively first, and if the treatment is not satisfactory, surgical treatment is feasible. Conservative treatment mainly involves VMO (Vertebrachial Obliquity Myofascial Muscle) functional exercises. The second case is more complicated. A series of detailed imaging tests, such as X-rays, CT plains, and MRI, are necessary for complete eradication. Depending on the patient’s specific situation, different surgical procedures are decided. From the beginning of human understanding of this disease to its manifestation, there are more than 100 specific surgical procedures. So, examination to gather detailed patient information is a must. Immediate imaging is recommended in the third case. This condition most likely makes an injury to the medial patellofemoral ligament (MPFL). Depending on the type of injury, the injured ligament should be reconstructed or repaired promptly. In our opinion, there is nothing more difficult to treat than the second condition. Doctors are often afraid to operate on patients with particularly severe injuries. These patients often have other problems, such as generalized ligamentous laxity syndrome, and many of these patients have patellar dislocation. The surgeon has to develop a surgical plan specific to the patient’s condition. Sometimes a combination of 3 or 4 different surgical procedures is needed to ensure that the surgery is effective and that it will not recur in the future. If the repeated dislocation of the patella is left unattended, it won’t take long for the cartilage on the patella and femur to wear away and the symptoms of osteoarthritis to appear.