What disease causes a bony prominence below the knee in a 13-year-old child?

Abnormal protrusion of the bone below the knee in a 13-year-old child may be caused by conditions such as tibial tuberosity osteochondritis, hypertrophic osteoarthritis, or osteochondroma. Detailed information is as follows:

1. Tibial Tuberosity Osteochondritis: The tibial tuberosity serves as the insertion point of the patellar tendon, and this condition is particularly evident during puberty. A 13-year-old child may experience abnormal protrusion of the bone below the knee, accompanied by symptoms such as swelling and tenderness. It is recommended to take medications such as ibuprofen tablets or indomethacin tablets under a doctor's guidance for treatment.

2. Hypertrophic Osteoarthritis: If a 13-year-old child develops osteophytes (bone spurs) in the knee joint, damage to the cartilage may lead to localized protrusion of the knee bone. Patients can take medications such as meloxicam granules or lornoxicam tablets under a doctor's supervision to alleviate discomfort.

3. Osteochondroma: This condition may cause bony prominences around the knee joint; therefore, abnormal protrusion of the bone below the knee in a 13-year-old child could be due to osteochondroma. Treatment options include procedures such as distal femoral osteochondroma excision or malignant tumor resection.

Additionally, other possible causes include trauma or degenerative osteoarthritis. It is advised that patients seek timely medical consultation at a hospital.