Spine and Pelvis 1

Question 1

AS for Sacroiliitis Radiographic findings

Answer 1

At Sacroiliac joint:
Ghost Joint
Star sign
Pseudo-widening
Erosive and sclerotic changes
Ankylosis

Extra:
Lumbosacroal Transitional Segment

Clinical finding:
Reduce chest expansion

Question 2

AS at spine (discovertebral) radiographic findings

Answer 2

Enthesis

Erosive lesions (Romanus lesion–> Squaring)

Reactive sclerosis (Shiny Corner Sign)

Ligament ossification (Thin marginal syndesmophytes) (Bamboo spine)

Trolley Track Sign

Dagger Sign

Question 3

Legg-Calve-Perthes Disease radiographic features

Answer 3

Increase medial joint space (waldenstrom sign)

Fragmentation (crescent sign)

Sclerosis

Metaphyseal widening and shortening

Question 4

Avascular Necrosis (AVN) radiographic features

Answer 4

Most sensitive modality: MRI

Location at anterosuperior weight-bearing portion of femoral head

Articular cortex collapse

Fragmentation and subchondral fractue (Cresent sign)

Sclerosis (Snowcap sign)

signs of degenerative joint

Question 5

Phleboliths

Answer 5

Concretion type of calcification

Pathogenesis:
upright posture and sudden intermittent changes in intra-abdominal pressure acting on the poorly supported and valveless pelvic veins

Extra:
small blood clots in a vein that harden over time due to calcification