Spontaneous Osteonecrosis Flashcards
Osteochondrosis part 2
Spontaneous Osteonecrosis: Knee AKA is
SONK
What is the MC site for spontaneous osteonecrosis:Knee?
Medical condyle of dist femur on the weight-bearing surface, lateral condyle
What group is spontaneous osteonecrosis in the knee most predominant?
usually 60+ females
Sontaneous osteoNecrosis: HIP
Its defined as?
Chanler’s disease, Idiopathic osteonecrosis of adult femoral head
Bone death to adult femoral head d/t unknown ischemia cause
MC site of avascular necrosis (Spontaneous osteoNecrosis:Hip aka Chandler’s disease aka idiopathic osteonecrosis) is
Who does it affect?
Femoral head
M 4:1 30-70 yoa
Clinically Chandler’s disease aka idiopathic osteonecrosis aka spontaneous osteonecrosis hip is seen in what age group?
How often?
M 30-70 yoa
4:1 50% bilateral
What clinical vague symptoms/features are seen in spontaneous Osteonecrosis:hip aka chandler’s disease?
pain in Buttock, groin, thigh and knee
which gradual increase in intensity
In a child spontaneous osteonecrosis hip aka Chandler’s disease is called what?
In a child before the growth plates close this disease is reffered to as? (same question)
Legg-Calve-Perthesdisease
- Pathologically, Chandler’s disease necrotic area is what? 2. In what location? 3. Occlusion of what is responsible for the avascularity?
- Typically wedged shape
- Ant. Sup. weight-bearing region
- Lat Epiphyseal and Sup. retinacular vessels
The avascularity produce what sign and appearance?
Bite sign, wedged or semilunar shape
What is the pathognomonic sign of Osteonecrosis?
Cortical collapse leads to what?
Subcondral fx, crescent sign
Step defect
What radiographic feature is a result of altered biomechanical stress placed on femur?
Buttressing
What sign represents the area of sclerosis in the femoral head?
Bite sign
On MRI T1 & T2 produce what type of signal?
T1 Low
T2 High
Early prognosis is another way of saying
Deformity
