Medial knee pain is commonly associated with osteoarthritis of the knee and meniscal injury, as follows: First, osteoarthritis of the knee: especially with unicondylar weight-bearing, the patient will show symptoms of medial knee pain and can show inversion deformity of the knee, especially in elderly patients. Active treatment, such as sodium glacial injection in the joint cavity and unicondylar joint replacement, can provide complete relief of pain symptoms; second, meniscal injury: damage to the medial meniscus of the knee can occur during flexion movements, resulting in meniscal tears. Patients may also exhibit painful symptoms on the medial side of the knee with joint movement restrictions such as joint interlocking. After an MRI, a tear of the medial meniscus can be detected, requiring arthroscopic surgery to suture the meniscus. In some patients, surgical suturing is not possible, so meniscus revision surgery can only be considered to eventually restore knee movement and relieve painful knee symptoms.