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Deformity after internal fixation of fracture separation of the medial epicondyle of the humerus



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Abstract

We reviewed 24 displaced fractures through the physis of the medial epicondyle of the distal humerus. One was a Salter-Harris type-II fracture-separation of the whole distal humeral epiphysis; the others involved only the medial epicondylar centre of ossification. Two cases had presented as pseudarthroses. One fracture had been treated closed in a plaster slab and 21 had had open reduction and internal fixation with sutures, Kirschner wires or Palmer nails. At 2 to 13 years later we found five types of deformity of the epicondyle: pseudarthrosis, an ulnar sulcus, a double-contoured epicondyle, hypoplasia or hyperplasia. Pseudarthrosis had developed after either no treatment, closed reduction and plaster, or open reduction and suturing. Hypoplasia followed nailing, as did a trend to varus tilting of the joint surface. One very young patient, with fracture-separation of the whole distal epiphysis treated by nailing, developed marked cubitus varus.

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