Many diseases near the knee joint can cause knee pain, most of which are manifested by painful stairs, such as chondromalacia patellae. Chondromalacia patella, also known as chondromalacia patellae and chondromalacia patellae, is a degenerative disease of the knee caused by chronic pain in the knee joint due to limited softening, fibrosis, fragmentation and detachment of the patellar cartilage due to strain and trauma, degeneration and even exposure of the cartilage bed bone. It is common in women. Chondromalacia patellae occurs mainly due to external stimuli or trauma causing structural changes to the patella, resulting in necrosis of cartilage cells, increased intraosseous pressure, inflammatory cell infiltration and abnormal secretion of joint fluid, resulting in a series of related clinical symptoms. The symptoms are mainly pain after strenuous exercise, which is aggravated when going downstairs, going downhill and semi-squatting at the knee, which is obvious when moving and gradually disappears after rest. The symptoms are not obvious when walking on a flat road. It can also manifest as difficulty and effort when squatting and standing up, often feeling weak and playing soft. There may be a ringing sound or a feeling of friction when the knee joint is moved, and the subpatellar fat pad is positive for pressure pain. Magnetic resonance imaging is a diagnostic test. Avoid strenuous sports, control weight, reduce the weight of the knee joint, pay attention to the warmth of the knee joint, etc. Conservative treatment: 1. Physical therapy. The quadriceps exercise can also be treated with external Chinese medicine plus selective electrical stimulation of the medial femoral muscle. 2.Tui-na manipulation. Through a variety of massage techniques to treat patients, can achieve the purpose of antispasmodic, balance, decompression. 3.Acupuncture therapy belongs to the category of “paralysis” in Chinese medicine. The knee eye point is an experienced point in the treatment of knee pain. Stimulation of the internal and external knee eye points with sparse and dense wave electroacupuncture can cause rhythmic contraction of local muscles and local vasodilation, thus promoting the circulation of joint fluid in the joint cavity and the small circulation of patellar cartilage. 4, Chinese medicine therapy Chinese medicine therapy mainly includes external application of towel medicine and fumigation. 5, intra-articular injection is a complementary therapy for the treatment of chondromalacia patellae. Exogenous sodium vitrate can limit the diffusion of inflammatory mediators, inhibit the release of painful substances and reduce knee pain. 6.Oral drugs that nourish cartilage. Surgical treatment: 1. Traditional surgery. Commonly used traditional surgical methods include modified tibial tuberosity elevation, tibial tuberosity displacement, subchondral bone drilling, periosteal transplantation, and artificial patellofemoral joint surface replacement. 2. Arthroscopic surgery. Knee arthroscopy has unique advantages in the diagnosis and treatment of early patellofemoral tenderness.