Joint deformities in RA

1. What is the most common type of atlantoaxial subluxation in RA? What is the maximum atlantoaxial space that is considered normal?
2. What type of foot deformities are seen in RA?
3. What type of ankle deformities are seen in RA?
4. What kind of hip deformities are seen in RA?
5. What kind of shoulder deformities are seen in RA?
6. What kind of elbow deformities are seen in RA?
7. What kind of knee deformities are seen in RA?

Answers:
1. Anterior subluxation is the most common. Any space larger than 2.5-3 mm is abnormal.
2. Hammer toe, claw toe, hallux valgus, lateral deviation of toes.
3. Increased hindfoot pronation, tarsal tunnel syndrome.
4. Protrusio acetabulum, which is inward bulging of acetabulum into pelvic cavity. Arthritis of hip joint.
5. Glenohumeral arthritis with early loss of int rot, effusions, frozen shoulder, rotator cuff injuries.
6. Subcutaneous nodules, olecranon bursitis, flexion deformities, ulnar neuropathies.
7. Loss of full knee extesnion, quad atrophy, Baker's cysts.