ossification

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

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