Musculoskeletal system and connective tissue (M00-M99).
- Crohn’s arthritis – Joint inflammation (arthritis) as a concomitant disease in Crohn’s disease (inflammatory bowel disease (IBD)).
- Heberden’s arthritis – form of osteoarthritis affecting the finger end joints (distal interphalangeal joints, DIP) and associated with the formation of Heberden’s nodes.
- Ankylosing spondylitis (ankylopoietic spondylarthritis) – seronegative spondyloarthropathy; chronic inflammatory disease of the spine that can lead to joint stiffness (ankylosis) of the affected joints. The sacroiliac joints (ISG; sacroiliac joints) are typically affected first.
- Reactive arthritis (synonym: postinfectious arthritis / joint inflammation) – second disease after gastrointestinal (gastrointestinal tract concerning), urogenital (urinary and genital organs concerning) or pulmonary (lungs concerning) infections; refers to an arthritis, where pathogens in the joint (usually) can not be found (sterile synovialitis).
- Reiter’s disease (synonyms: Reiter’s syndrome; Reiter’s disease; arthritis dysenterica; polyarthritis enterica; postenteritic arthritis; posturethritic arthritis; undifferentiated oligoarthritis; urethro-oculo-synovial syndrome; Fiessinger-Leroy syndrome; English Sexually acquired reactive arthritis (SARA)) – special form of a “reactive arthritis” (see above. ); secondary disease after gastrointestinal or urogenital infections, characterized by the symptoms of Reiter’s triad; seronegative spondyloarthropathy, which is triggered especially in HLA-B27 positive persons by an intestinal or urinary tract disease with bacteria (mostly chlamydia); Can manifest as arthritis (joint inflammation), conjunctivitis (conjunctivitis), urethritis (urethritis) and partly with typical skin changes.
- Rheumatoid arthritis (chronic polyarthritis) – chronic inflammatory multisystem disease, which usually manifests itself in the form of synovitis (synovial inflammation). It predominantly affects the joints (polyarthritis, i.e. arthritis of ≥ 5 joints), more rarely other organs such as eyes and skin.
- Spondyloarthritides (inflammation of the vertebral joints), other genesis (origin).
