Final Exam: AVN & Infection Review Questions

Squared patella, epiphyseal overgrowth and a widened intercondylar notch may suggest:

hemophilic arthropathy

Is a bone scan the same as a DEXA scan?

no; DEXA measures bone density (osteoporosis) and bone scan looks for hot spots

What is a Marjolin's ulcer?

squamous cell carcinoma associated with a crhonic infectious ulcerative channel

What are the differential diagnoses for unilateral sacroiliitis?

-AS

-DJD

-gout

-trauma

-pregnancy

A unilateral sacroiliitis, with a negative HLA B27, elevated WBCs and an elevated ESR would suggest:

potential infection of the SI articulation

What is an involucrum?

layer of living bone formed around dead bone; forms a periosteal bony collar of new bone seen with an infection

A "crescent sign" is associated with a(n):

AVN

What is juvenile discogenic disease (JDD)?

aka scheuermann's disease

True or False? All cases of Scheuermann's disease could be called JDD, but not all cases of JDD could be called Scheuermann's disease

true

Decreased disc height at T12 with destructive changes of the opposing endplates with a gibbus formation would suggest a(n):

spondylodiscitis (likely TB)

What is Phemister's Triad?

1. juxta-articular osteoporosis

2. marginal erosions

3. slow loss of joint space

What are some various etiologies of an AVN?

-pancreatitis

-pregnancy

-lupus

-alcoholism

-atherosclerosis

-steroids

-trauma

-idiopathic infections

-vaisson disease

-collagen disease

-RA

-amyloid

-gaucher disease

-sickle cell disease/spontaneous

What organism is the most common cause of osteomyelitis?

staph. aureus

"H" shaped vertebra or "lincoln log" vertebra indicate:

sickle cell anemia

What is Kohler's Disease?

AVN of the navicular or possibly a normal variant; pain and swelling would represent true AVN of navicular

What is a Brodie's abscess?

localized aborted form of suppurative osteomyelitis; pain is worse at night and it can mimic an osteoid osteoma

What is the favorite location for an osteochondritis dissecans (OCD)?

the knee; especially the lateral aspect of the medial femoral condyle

-can also be in capitulum and talus

AVN has a predisposition for which part of a bone and for which bones?

epiphyseal region of bone and particularly the femur head and humeral head

What organism is the most common to be involved wiht an infection (osteomyelitis)?

staph. aureus

What is Pott's Disease?

tuberculosis of the spine

What age is most likely to have osteochondritis dissecans?

children and adolescents

Destructive changes on both sides of an articulation would suggest a(n):

infection (septic arthritis with osteomyelitis)

Spondylodiscitis associated with a cold abscess with calcification would suggest:

pott's disease (TB of spine)

Decreased joint space or decreased disc height would suggest _____, _____ or _____

developmental hypoplasia ; infection ; joint disease