Heterotopic ossification may occur following surgery or trauma to an extremity. Brooker et al developed a classification to grade the severity of ossification adjacent to a joint.
Parameters:
(1) radiographic findings
(2) joint movement and function
Ossification on X-Rays
Joint Movement and Function
Class
none
normal
0
islands of bone in the soft tissue
normal
I
bone spur with gap between opposing bone surfaces >= 1 cm
mild loss
II
bone spur with gap < 1 cm
moderate loss
III
bridges joint
severe loss with joint ankylosis
IV
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