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Flashcards in Imaging (arthritis) Deck (10):
1

What joints are affected in osteoarthritis?

Joint involvement often assymetrical
(eg right hip, left knee)
Usually affects weight bearing or active joints
(spine, hip, knee, thumb base, DIP)
Sometimes affects other joints where:
overuse
previous injury
previous arthritis

2

What does loss of joint space on imaging show?

Osteoarthritis

3

How are cysts in bone formed?

Synovial fluid dissects into bone, forming cysts

4

What leads to marginal osteophyte formation?

Periosteal stimulation

(periostium causes more bone to form at joint margin)

5

What joints are affected in rheumatoid arthritis?

Joint involvement usually symmetrical

Can affect any synovial joint but commonly:
MCP, MTP
PIP (not DIP)
Wrists, hips, knees, shoulders
Atlantoaxial joint (C1/2)

6

What radiological features are seen of rheumatoid arthritis?

Synovial proliferation and reactive joint effusion causes soft tissue swelling

Hyperaemia causes bone demineralisation resulting in periarticular osteoporosis

Inflammatory pannus destroys bone, initially at the joint margins

Capsular and ligamentous softening allows joint subluxation and deformity

Exposed eroded bone ends may fuse (ankylosis) (rare)



7

What radiological features are seen of seronegative arthritis?

Sacroiliac joint and spine involvement

Ill-defined periarticular bone formation

Tendency to joint ankylosis

8

What is "ankylosis"?

Abnormal stiffening and immobility of a joint due to fusion of the bones


9

What scan shows increased vascularity around joints (accompanies synovitis)?

Isotope bone scan

10

Thickening of synovium and increased blood flow within it can be demonstrated by:

Colour Doppler ultrasound