Atlanto-axial Rotatory Instability
Definition
Acute dislocation of the atlanto-axial facet joint
Present with acute torticollis
Etiology
Children
Acute dislocation of the atlanto-axial facet joint
Present with acute torticollis
Children
Fractures
Principle
- do very poorly with fixation
- hemiarthroplasty or THR
- stem should be 2.5 cortical diameters beyond any area of weakness
- THR if acetabulum involved
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