Arthritis

DDX By Number of Affected Joints

1. Monoarthritis
   1. Trauma-induced arthritis
   2. Nongonococcal septic arthritis
   3. Gonococcal septic arthritis
   4. Crystal-induced (gout, pseudogout)
   5. Osteoarthritis (acute)
   6. Lyme disease
   7. Avascular necrosis
   8. Tumor
2. Oligoarthritis
   1. Lyme disease
   2. Reactive arthritis (Reiter syndrome)
   3. Ankylosing spondylitis
   4. Gonococcal arthritis
   5. Rheumatic fever
3. Polyarthritis
   1. Rheumatoid arthritis
   2. SLE
   3. Viral arthritis
   4. Osteoarthritis (chronic)
   5. Serum sickness
   6. Serum sickness–like reactions

DDX For Migratory Pattern

1. Gonococcal arthritis
2. Acute rheumatic fever
3. Lyme disease
4. Viral arthritis
5. SLE

Source

• Tintinalli