Flashcards in Imaging (arthritis) Deck (10):
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:
What does loss of joint space on imaging show?
How are cysts in bone formed?
Synovial fluid dissects into bone, forming cysts
What leads to marginal osteophyte formation?
(periostium causes more bone to form at joint margin)
What joints are affected in rheumatoid arthritis?
Joint involvement usually symmetrical
Can affect any synovial joint but commonly:
PIP (not DIP)
Wrists, hips, knees, shoulders
Atlantoaxial joint (C1/2)
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)
What radiological features are seen of seronegative arthritis?
Sacroiliac joint and spine involvement
Ill-defined periarticular bone formation
Tendency to joint ankylosis
What is "ankylosis"?
Abnormal stiffening and immobility of a joint due to fusion of the bones
What scan shows increased vascularity around joints (accompanies synovitis)?
Isotope bone scan