heterotopic ossification

Definition

Pathological bone formation in soft tissues

Epidemiology

In elbow

- 3% of trauma

- 89% if head injury + trauma

Types

Completely different

1.  Myosisitis Ossificans Circumscripta

- post traumatic

- more common

- recognised as a consequence of neurological injury

DDx

Parosteal OS

- bone is not continuous with cortex in MO

Aetiology

3% incidence in elbow joint trauma to some degree

Definition

Extraskeletal bone formation in periarticular tissues 

- HA crystals within osteoid matrix

Different to calcification 

- osteoid matrix laid down

Types

1.  Myositis Ossificans

- post traumatic