Radiology of Arthritis and Bone Pathologies Flashcards
What is meant by a ‘distracted’ fracture?
Bone pieces are pulled apart in the fracture
What is meant by a ‘comminuted’ fracture?
Bone is broken up into lots of small pieces
What is meant by a ‘compound’ fracture?
Open to the skin, more likely to be infection
What is meant by a ‘overriding’ fracture?
Dense, sclerotic lesion due to overriding bits of bone
Extra-articular fractures are at higher risk for development of arthritis than intra-articular fractures. t/f?
False - the opposite is true
Why do intracapsular fractures of the femoral head require surgical intervention?
These fractures are at high risk of avascular necrosis.
What sign on x-ray is specific for Paget’s disease?
Blade of grass sign
What type of joint changes are seen in degenerative arthritis?
Increased bone production - osteophytes
What type of joint changes are seen in inflammatory arthritis?
Periarticular erosions
What type of joint changes are seen in depositional arthritis?
Periarticular soft tissue masses
Active erosions are likely to appear well-defined on x-ray. T/F?
False - active erosions are ill-defined, old erosions are well-defined
What is primary degenerative arthritis?
Intrinsic degeneration of the articular cartilage caused by excessive wear and tear
What joints are commonly affected by primary degenerative arthritis?
Hips
Knees
What signs of primary degenerative arthritis are seen on x-ray?
Narrowed joint spaces
Osteophytes
Subchondral sclerosis/cysts
What is secondary degenerative arthritis?
Arthritis caused by another process which destroys the articular cartilage
What are the common causes of secondary degenerative arthritis?
Trauma Infection Avascular necrosis CPPD RA Haemophilia
What are the uncommon causes of secondary degenerative arthritis?
Haemachromatosis
Acromegaly
Ochronosis
Wilson’s disease