I – Polyarthritis of unknown etiology
- Rheumatic arthritis
- Juvenile rheumatoid arthritis (Still’s disease)
- Ankylosing spondylitis
- Psoriatic arthritis
- Reiter’s syndrome
- Others
II – Connective tissue disorders
- Systemic lupus erythematosus (SLE)
- Polyarteritis nodosa
- Scleroderma (progressive systemic sclerosis)
- Polymyositis and dermatomyositis
- Others
III – Rheumatic fever
IV – Degenerative joint disease (osteoarthritis, osteoarthrosis)
- Primary
- Secondary
V – Nonarticular rheumatism
- Fibrositis
- Intervertebral disk and low back syndromes
- Myositis and myalgia
- Tendinitis and peritendinitis (bursitis)
- Tenosynovitis
- Fasciitis
- Carpal tunnel syndrome
- Others (including VIII – shoulder/hand syndrome)
VI – Diseases frequently associated with arthritis
- Sarcoidosis
- Relapsing polychondritis
- Henoch-Schönlein syndrome
- Ulcerative colitis
- Regional ileitis
- Whipple’s disease
- Sjögren’s syndrome
- Familial Mediterranean fever
- Others (including I – psoriatic arthritis)
VII – Associated with known infectious agents
- Bacterial
- Borrelia burgdorferi (Lyme disease)
- Brucella
- Gonococcus
- Mycobacterium tuberculosis
- Pneumococcus
- Salmonella
- Staphylococcus
- Streptobacillus moniliformis (Haverhill fever)
- Treponema pallidum (syphilis)
- Treponema pertenue (yaws)
- Others
- Rickettsial
- Viral
- Fungal
- Parasitic (including III – rheumatic fever)
VIII – Traumatic and/or neurogenic disorders
- Traumatic arthritis (the result of direct trauma)
- Lues (tertiary syphilis)
- Diabetes
- Syringomyelia
- Shoulder-hand syndrome
- Mechanical derangement of joints
- Others (including IV – degenerative joint disease and V – carpal tunnel syndrome)
IX – Associated with biochemical or endocrine abnormalities
- Gout
- Ochronosis
- Hemophilia
- Hemoglobinopathies (e.g,. sickle cell disease)
- Agammaglobulinemia
- Gaucher’s disease
- Hyperparathyroidism
- Acromegaly
- Hypothryroidism
- Scurvy
- Xanthoma tuberosum
- Others (including X – multiple myeloma and Xii – Hurler’s syndrome)
X – Tumor and tumor-like conditions
- Synovioma
- Pigmented villonodular synovitis
- Giant cell tumor of tendon sheath
- Primary juxta-articular bone tumors
- Metastatic
- Leukemia
- Multiple myeloma
- Benign tumors of articular tissue
- Others (including XIII – hypertrophic osteoarthropathy)
XI – Allergy and drug reactions
- Arthritis due to specific allergens (e.g., serum sickness, nightshade vegetables, other foods)
- Arthritis due to drugs (eg. Hydralazine syndrome)
- Others
XII – Inherited and congenital disorders
- Marfan’s syndrome
- Ehlers-Danlos syndrome
- Hurler’s syndrome
- Congenital hip dysplasia
- Morquio’s disease
- Others
XIII – Miscellaneous disorders
- Amyloidosis
- Aseptic necrosis of bone
- Behçet’s syndrome
- Chondrocalcinosis (pseudogout)
- Erythema multiforme (Stevens-Johnson syndrome)
- Erythema nodosum
- Hypertrophic osteoarthropathy
- Juvenile osteochondritis
- Osteochondritis dissecans
- Reticulohistiocytosis of joints (lipoid dermato-arthritis)
- Tietze’s disease
- Others
