The protrusion of the inner side of the kneecap may be caused by knee valgus, osteophytes, meniscus cysts and other diseases, and the patient can take medication and surgical treatment. 1. Knee valgus:Deformity of the lower leg to the outer side is knee valgus deformity. For knee valgus caused by the medial protrusion of the kneecap, patients can take oral vitamin D tablets, calcium lactate tablets and other nutrients as prescribed by the doctor. Patients can also take surgical treatment, mainly take osteotomy, total knee arthroplasty and other surgical methods. 2. Osteomalacia: Osteomalacia of the knee joint can also lead to the phenomenon of protrusion of the inner side of the kneecap, the patient can follow the doctor’s instructions to take oral celecoxib capsules, erliximab capsules and other non-steroidal anti-inflammatory drugs. In addition, patients can also take surgical treatment, mainly arthroscopic cleanup, osteotomy, joint fusion, artificial joint replacement and other surgical methods. 3. Meniscus cyst:For the meniscus cyst caused by the medial protrusion of the kneecap, patients can follow the doctor’s prescription oral diclofenac sodium extended-release tablets and other non-steroidal anti-inflammatory drugs. Patients with meniscal cysts can also take surgical treatment, such as local excision of the cyst, removal of the damaged meniscus and cyst and other surgical procedures. There are many other causes of medial protrusion of the kneecap, including bone tumors of the lower end of the femur and the upper end of the tibia, bone fractures and fracture deformity healing, etc. Patients with symptoms of medial protrusion of the kneecap should consult a doctor in a timely manner to find out the cause of the disease, and comply with the doctor’s instructions for treatment.