Diagnosis

21u-M/7 Ulna, avulsion of the apophysis

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21u-M/7

21u-M/7

Note: the ulnar apophysis may have two ossification centers. This may be misinterpreted as an avulsion fracture.

An avulsion fracture of the olecranon does not involve the articular surface.

An undisplaced avulsion is stable because of the tension band effect of the periosteum and fascia.