MSK Orals Review

• Used to stage osteonecrosis.
• Stages:
• 1. Normal to slightly incr or decr density
• 2. Mixed osteopenia & sclerosis
• 3. Subchondral collapse ("crescent sign")
• 4. Articular collapse
• 5. Degenerative joint disease

• Trauma
• SLE
• alcoholism
• pancreatitits
• pregnancy
• Gaucher's
• Cushing's
• Caisson's disease

Osteochondrosis of tibial tuberosity

• Subperiosteal bone resorption.
• Acro-osteolysis
• Radial surface of middle phalanges
• Distal clavicle
• Medial aspect of femur, humerus, tibia
• Distal metaphysis of radius, ulna

• Ankylosing spondylitis. "Bamboo Spine" is an Aunt Minnie.
• Dz onset 15-35yo. M>>F.
• 90% HLA-B27+

Presentation: Low back pain/stiffness

Sacroiliitis is hallmark of disease.

Sacroiliac joint is classically the first joint involved in ankylosing spondylitis.

Ossification of annulus fibrosis.

Characteristic of ankylosing spondylitis.

• Septic arthritis
• Hemophilia
• JRA

Effusion from hemophilia (hemorrhage) is more radiodense than simple effusion.

Septic joint and acute hemarthrosis can present the same (F, incr WBC, warmth, tenderness, etc).

• Apert's
• Ellis-van Creveld
• Down
• Fanconi's
• Laurence-Moon-Biedl
• Pierre-Robin
• T13
• T18
• NF
• Absent radius syndrome
• Acrocephalopolysyndactyly
• Chondrodysplasia punctata

CANT PuT up the FADE-away

Osteopetrosis -

Rare hereditary bone dz.

Failure of spongiosum to form properly gives characteristic radiographic appearance.

• "Sandwich vertebra"
• "Erlenmeyer flask deformity"
• "Bone in bone"

Osteopetrosis

Osteopetrosis

Osteopetrosis