ossification

Xray

Calcification

- central pattern

- often increased opacity compared with bone

Ossification

- peripheral pattern

- similar density to bone

Age of appearance in girls

C (capitellum)               1

R (radiua)                     3

I  (internal epicondyle)   5

T  (trochlea)                  7

Anatomy

Bones more elastic and malleable

- absorb much more energy

Very thick periosteum

- can be periosteal sleeve fracture

Ossification

Triradiate cartilage fuses 13-16

Iliac / Ilium / ASIS apophysis

- appear as teenager

- fuse a couple of years later

- can confuse with fracture

Classification Key & Conwell 1951

Ossification

Atlas

Three 1° Ossification centres

- two lateral masses with posterior arch in between

- anterior arch which appears at 1 year

- posterior arch fuses at 4 years

- anterior & posterior fuses to body at 7 years

Axis

Five 1° Ossification centres

- two neural arches / lateral masses

- two 1/2 dens

- body

Five 2° Centres