Chondromalacia patellae is a common name, also known as lateral patellar extrusion syndrome, and is accurately referred to as patellofemoral joint cartilage damage. The cause is complex and may be due to congenital patellofemoral joint development, excessive exercise, cartilage wear and tear, or obesity. Once the cartilage is damaged, it cannot be repaired, which means that it is impossible to return to normal cartilage. However, cartilage damage can be asymptomatic, such as pain, and there are ways to delay further damage to articular cartilage and reduce pain and other symptoms. In recent years, with the widespread use of sports, the incidence has increased in younger people. When you have the following symptoms, you can consider the possibility of chondromalacia patellae and try the methods described in this article for initial treatment. I. Main manifestations: 1. Knee pain occurs in the absence of sprain, and early manifestations are pain going up or down stairs after strenuous exercise (e.g. climbing mountains, playing basketball). 2. It can also manifest as difficulty in squatting, effort in standing up from squatting, pain, often feeling weak and playing soft. 3.There can be a ringing sound and a feeling of friction when the joint moves. Continued development can appear walking flat pain, joint swelling. Second, treatment: 1, it should be noted that the disease is often caused by strenuous exercise, such as climbing mountains, stairs, playing badminton or basketball, playing tai chi, repeated squatting exercises, etc.. The pressure on the patellofemoral joint when jumping up is 5-10 times the weight. Therefore one of the important elements of treatment is that the above exercises should be avoided. Walking on a flat road is possible. 2, exercise thigh muscle strength, that is, quadriceps strength exercises. Because the quadriceps muscle is enhanced, it can reduce the pressure on the patellofemoral joint, stabilize the knee joint, and can play a role in protecting the cartilage. The main exercise methods are straight leg lifts (can be appropriate resistance) and static squat exercises. If the above methods do not improve, a visit to the hospital should be made for the necessary examination. Axial patellar films should be taken to see if the patella is tilted, nuclear magnetic examination, etc. Treatment may include topical medication, ultrashort wave physical therapy, oral glucagon, Vigorix, and intra-articular injection of sodium hyaluronate. For severe pain, you can take oral non-steroidal anti-inflammatory painkillers. There are many types of these drugs, which can be selected according to different requirements. Attachment: Straight leg lift exercise: lying down, thigh muscles fully contracted, after straightening the knee joint, straight leg lift until the heel is 15M from the bed, hold until exhaustion, interval 10 seconds, 12 times/group, 3-5 groups/day. Adjust according to strength, or you can hang a weight on your foot for the exercise. The key is to fully straighten the knee joint, a slight bending of the knee joint significantly reduces the effect. Squat: similar to the zigzag stance. Back against the wall, feet and knees shoulder-width apart, toes forward, squatting to a certain angle, the center of gravity on the affected foot, self-control squatting depth, the basic control can be in about 2 minutes to reach full fatigue, the interval does not exceed 10 seconds, 5-10 consecutive groups, 2 groups of days. If the affected limb in the squat will produce pain, you can avoid the injury interval by way of up and down fine-tuning the angle, try to make the exercise does not occur in the pain arc range.