Viola and Hastings classified ectopic ossification involving the radioulnar joint and proximal forearm. The type can be helpful in planning the best surgical approach. The authors are from Indiana University.
Requirement: CT or MRI study of the elbow and proximal forearm
Location of Ossification
Type
proximal radioulnar joint
I
proximal radioulnar joint to bicipital tuberosity
II
spares radioulnar joint, extending distally
III
Radioulnar Joint
Extending Distally
Type
Yes
No
I
Yes
Yes
II
No
Yes
III
Location of Ossification
Subtype
limited to anterior
A
limited to posterior
B
involves the midpoint
C
where:
• A patient may have more than one subtype, with A and B if there is sparing in the mid-portion.
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