Possible causes of a bulge in the knee include joint effusion, trauma, bone tumor and so on.
1. Joint effusion: Because of the inflammatory reaction of knee synovitis, gout, etc., a large amount of fluid is secreted and accumulated in the joint cavity of the knee joint, which can lead to symptoms such as swelling, pain and fever in the knee joint.
2. Trauma: after trauma, the capillaries around the knee joint rupture and subcutaneous hematoma occurs, or the skin breaks down and becomes infected, and subcutaneous abscess occurs, all of which can appear in the knee joint lump.
3. Bone tumor: such as osteosarcoma, osteochondroma, etc., because of the swelling growth of tumor cells, causing joint enlargement, which can also be manifested as a local lump.
If you find knee joint lump with pain, deformity or systemic symptoms such as fever and continue to be unrelieved, it is recommended to consult a doctor in time to clarify the cause of the disease and diagnose and treat it under the guidance of a doctor.