II. Finding: Decreased bone density
III. Finding: Bony erosions
- Erosive Osteoarthritis in postmenopausal women
-
Rheumatoid Arthritis
- Juxta-articular Osteopenia is an early finding
-
Psoriatic Arthritis
- Erosions begin at joint margins as with Rheumatoid Arthritis
- Erosions may progress to involve central joints (pencil-in-cup erosion)
- Ankylosing Spondylitis
- Tophaceous or Polyarticular gout
- Rat-bite erosions with well defined, sclerotic margins
IV. Finding: Cyst Formation
- Osteoarthritis (Subchondral cysts)
- Rheumatoid Arthritis (Synovial cysts)
- Calcium Pyrophosphate Deposition Disease (CPPD)
V. Finding: Joint space narrowing
- Osteoarthritis (non-uniform narrowing)
- Rheumatoid Arthritis (uniform)
- Calcium Pyrophosphate Deposition Disease (uniform)
- Psoriatic Arthritis
- Ankylosing Spondylitis
VI. Finding: Bone production
- Osteophytes
- Osteoarthritis
- Calcium Pyrophosphate Deposition Disease (CPPD)
- Diffuse Idiopathic Skeletal Hyperostosis (DISH)
- Subchondral Sclerosis
- Osteoarthritis
- Calcium Pyrophosphate Deposition Disease (CPPD)
- Tendon and Ligament Ossification
- Diffuse Idiopathic Skeletal Hyperostosis (DISH)
- Chondrocalcinosis
- Calcium Pyrophosphate Deposition Disease (CPPD)
VII. References
- Brower (1998) Arthritis Black and White, Saunders
- Foster (2023) Am Fam Physician 107(1): 42-51 [PubMed]