Blood, blood-forming organs – immune system (D50-D90).
- Hemophilia (hemophilia).
Musculoskeletal system and connective tissue (M00-M99).
- Arthritis (inflammation of the joints), unspecified.
- Gout (arthritis urica/uric acid-related joint inflammation or tophic gout)/hyperuricemia (elevation of uric acid levels in the blood)
- Gonarthrosis (osteoarthritis of the knee joint)
- Rheumatoid arthritis (chronic polyarthritis) – most common inflammatory disease of the joints.
Neoplasms – tumor diseases (C00-D48).
- Tumors of the knee joint, unspecified.
Injuries, poisonings, and other consequences of external causes (S00-T98)
- Fractures (broken bones) of the knee joint, unspecified.
- Free joint bodies
- Bone/cartilage injuries in the area of the knee joint, unspecified.
- Unhappy triad injury – medial meniscus lesion, anterior cruciate ligament rupture, and medial collateral ligament tear.
