An arthropathy is a disease of a joint.^[2]

Arthritis is a form of arthropathy that involves inflammation of one or more joints,^[3][4] while the term arthropathy may be used regardless of whether there is inflammation or not.

Joint diseases can be classified as follows:^{[citation needed]}

• Arthritis

• Infectious arthritis

• Septic arthritis (infectious)
• Tuberculosis arthritis
• Reactive arthritis (indirectly)

• Noninfectious arthritis

• Seronegative spondyloarthropathy:

• Psoriatic arthritis
• Ankylosing spondylitis

• Rheumatoid arthritis:

• Felty's syndrome

• Juvenile idiopathic arthritis
• Adult-onset Still's disease
• Crystal arthropathy

• Gout
• Chondrocalcinosis

• Osteoarthritis

• Hemarthrosis (joint bleeding)
• Synovitis is the medical term for inflammation of the synovial membrane.
• Joint dislocation

Joint pain is a common but non-specific sign of joint disease. Signs will depend on the specific disease, and may even then vary. Common signs may include:^{[citation needed]}

• Decreased range of motion
• Stiffness
• Effusion
• Pneumarthrosis, air in a joint (which is also a common normal finding).
• Bone erosion
• Systemic signs of arthritis such as fatigue

Diagnosis may be a combination of medical history, physical examination, blood tests and medical imaging (generally X-ray initially).^{[citation needed]}