Background
Definition![Knee OCD MRI Cartilage Intact](/sites/default/files/LowerLimb/OCD MRI Cartilage Intact.jpg)
Osteochondritis Dissecans
- separation of avascular fragment of bone & cartilage
Epidemiology
M : F = 2:1
Mean age 18 years
- can present as young as 9
4:1000
Osteochondritis Dissecans
- separation of avascular fragment of bone & cartilage
M : F = 2:1
Mean age 18 years
- can present as young as 9
4:1000
Rare low-grade malignant tumour
- cell of origin unknown
Usually second or third decade of life
90% diaphysis of tibia
Mandible
Most common anterior cortex of tibia
Definition
Infection of bone 2° blood-borne bacteria
Most common children
- peak 10 years
True haematogenous OM rare in adults
- usually involves spine
M: F 2:1
Most common femur & tibia