Osteoarthritis

1. What is the definition of OA?
2. What is the most common type of arthritis?
3. Which joints are usually affected by primary idiopathic OA?
4. Which joints are usually affected by secondary OA with a recognizable cause?

Answers:
1. A noninflammatory progressive disorder of the joints leading to deterioration of articular cartilage and new bone formation.
2. OA.
3. Knees, MTP, DIP, CMC, hips, spine.
4. Elbows and shoulders.