Congenital Ulna Pseudarthrosis
This malformation is very rare. This form of pseudarthrosis can affect the ulna and radius and result in shortening and bending.
These malformations can also restrict movement.
There are 2 types of this congenital pseudarthrosis according to H. B. Boyd and F. P. Sage:
Typ I: A cystic defect, with or without fracture, is present and the pathological findings resemble those in fibrous dysplasia.
Typ II: The second shows sclerosis and tapering of the bone ends, probably due to a constricting band of fibrous tissue. In this type, union is more difficult to secure.
Picutres of Pseudarthrosis of the Ulna
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