Patellofemoral joint disorders (patellar tilt, patellar subluxation) are common causes of patellar instability, while articular cartilage damage caused by abnormal patellar alignment and trajectory and the resulting abnormal stress distribution is also the main cause of patellofemoral joint pain and is a common patellofemoral joint disorder. It is a common disease of the patellofemoral joint. It is characterized by anterior knee pain, abnormal patellar trajectory and patellofemoral cartilage damage. With the continuous research on osteoarthrosis of the knee, which is mainly characterized by cartilage degeneration, it has been found that patellofemoral disorders account for a high proportion of osteoarthrosis of the knee, and the success of its treatment is directly related to the efficacy of osteoarthrosis of the knee. Abnormal knee The lateral support band consists of two main structures: the superficial oblique support band connecting the lateral patella to the iliotibial bundle is the more secondary part. The deeper transverse support band is much broader and has internal structures of the lateral patellofemoral ligament, patellofemoral-tibial bundle, and iliopatellar bundle. These structures must be severed intraoperatively, and even a partial severance of the lateral femoral muscle is required to achieve complete release. Arthroscopic release of the medial and lateral patellofemoral support bands is performed using arthroscopic observation of the patellofemoral joint relationship and intra-articular severance of all the tense lateral patellofemoral structures: support band, synovial membrane, and lateral femoral muscle stops, with the advantages of small incision, minimal trauma, early activity, and good recovery. The scope of release is generally from the lateral femoral muscle to the lateral incision. The depth is determined by cutting the superficial oblique fibers and the deep transverse fibers of the lateral support band. To prevent medial instability caused by excessive release, the patellofemoral dyad should be observed under the microscope while the release is being performed. Intraoperatively, it can be observed that after the release of the lateral support band, the center of the patella shifts inward and the intercondylar concave engagement with the femur improves significantly. This not only corrects the patellar line of force, but more importantly, reduces the contact pressure on the patellofemoral articular surface, changes the painful contact surface of the cartilage, and interrupts the vicious cycle. Complications Previous literature reports that the main complication of either incision or arthroscopic release of the lateral support band is hematoma formation, the incidence of which varies from 1% to 42%. This area is the least vascularized area of the lateral support band because the superior lateral knee artery enters the support band along the distal fibers of the lateral femoral muscle. Even if only part of the lateral femoral muscle is severed, it is likely to lead to postoperative hematoma formation and prolong recovery time. Postoperative pressure pads placed on the lateral patella, compression bandages and local ice packs are also effective methods to prevent and reduce the formation of hematoma. Postoperative rehabilitation Although arthroscopic surgery is minimally invasive, in terms of osteoarthritis debridement with support band release, the patient’s intra-articular shaving injury is not light, and the large scale synovial and crease resection, whether by electric shaving system or plasma vaporizer, will leave a large trauma, and the deep tissue damage caused by support band release, the extravasation of lipid droplets in the bone marrow after cartilage drilling and bone removal will increase the patient’s postoperative reaction and Therefore, the rehabilitation of such patients should be different from that of simple arthroscopic surgery, and the premature movement is not conducive to swelling reduction and functional recovery. The “RICE principle” is used in the postoperative period. In most of the patients, the swelling has basically subsided by then. In a few patients, however, the swelling lasted for 3 to 4 weeks, which required restriction of activities. VMO muscle strength exercises were started 6 weeks after surgery.