To Compare the Clinical Efficacy of Arthroscopic Lateral Retinacular Release and Exercise Therapy in the Treatment of Lateral Patellar Crush Syndrome

Inclusion Criteria: * ① Meet the diagnostic criteria of LPCS; ② Complete imaging data; ③ agree that the follow-up time should be at least 1 Years; ④ Those who are willing to conduct regular rehabilitation training can cooperate to complete the experiment by signing the informed consent. Exclusion Criteria: * ① Complicated with severe heart, brain, kidney and other organ dysfunction;② Combined with patellar instability, patellar dislocation or others Severe knee joint disease and injury; ③ The previous history of joint infection, joint tuberculosis or osteomyelitis, or the lower extremity in 6 A history of surgery within the last month and previous knee surgery; ④ Infection, cancer, pregnancy and mental disorders Those with special conditions. ⑤ patients with mental illness or cognitive impairment, unable to study and participate in rehabilitation training; ⑥ not Informed consent was obtained.