MRI
Periosteal Osteosarcoma
Definition
Intermediate grade chondroblastic osteosarcoma arising from surface of long bones
Epidemiology
Extremely rare
- 1% of all osteosarcomas
- 25% of surface osteosarcomas
Age 15-25
Location
Typically anterior proximal tibia
- diaphysis of major long bones
- humerus
Pathology
Ossification posterior longitunal ligament (OPLL)
Definition
Ossification of the posterior longitudinal ligament (OPLL)
Heterotopic ossification of the posterior longitudinal ligament
Epidemiology
2:1 Male:Female
More common in Japanese and East Asian populations
Articular process fractures
Articular process fracture
Natural history
Superior articular process fracture
- potentially unstable
Inferior articular process fracture
- thought to be more stable
CT scan
Ulna collateral ligament
Definition
Injury to ulnar collateral ligament of thumb MCPJ
Interferes with pinch grip and grasp and thumb is ineffective as a post
Femoral neck stress fractures
Femoral Neck Stress Fractures
Aetiology
Athletes with increase activity / distance
Women with eating disorders / amenorrhea
Types
Compression / inferior neck
- < 50% protective weight bear
- > 50% emergent ORIF
Tension side / superior neck
- emergent ORIF
Hoffa fracture
Definition
Coronal plane fracture of distal femoral condyle
- intra-articular
- often only attachment is posterior capsule
Epidemiology
Rare
Mechanism
Usually a severe valgus trauma
Xray
Hangman's / C2 Fracture
Definition
Bilateral Pars Fracture C2
- traumatic axis spondylolisthesis
NHx
Neurological injury uncommon
- fragments separate and decompress
Different to judicial hanging where spinal cord is severed
Xray