The first acute patellar dislocation is most common in females aged 10-17 years old and is mostly caused by knee flexion and valgus sprain. The first dislocation usually results in a fall to the ground, severe pain and obvious knee swelling, and most patients feel that the patella is misaligned to the side, and the patella often resets itself when the knee is straightened, so it is easy to miss or misdiagnose. In addition to a history of more than one lateral dislocation of the patella, patients with recurrent dislocation often have a feeling of instability with the patella dislocating to the lateral side. Acute dislocation of the patella can be treated conservatively if there is no obvious osteochondral debris in the joint, no obvious bony developmental abnormalities of the knee joint, and no obvious tears in the soft tissue of the medial patella. In addition, even if there are osteochondral fragments in the joint, conservative treatment can be considered if the osteochondral fragments are small and may adhere to the joint capsule and other soft tissues without forming a free body and causing symptoms such as interlocking. However, the recurrence rate of conservative treatment is generally high (20%-50%), especially for young female patients and patients with patellofemoral dysplasia. The recovery time after surgery for acute patellar dislocation is usually 2-3 months, while the recovery time for conservative treatment is relatively short. Since first-time acute patellar dislocation patients are usually primary and secondary school students, with heavy homework and schoolwork, surgery can have a great impact on students, even taking a year off from school, so conservative treatment can be considered as much as possible. Conservative treatment methods: 1. If the joint swelling is obvious in the acute stage, joint puncture can be performed to draw out the accumulated blood in the joint, and then pressure bandaging is applied; 2. joint flexion exercises; 5, to adhere to strengthen muscle strength exercises, when the quadriceps muscle strength recovery to more than 85% of the healthy side, you can participate in sports activities. 6. Try to avoid turning the body toward the healthy knee as well as flexion and valgus movements of the affected knee during exercise to reduce the recurrence of patellar dislocation.