Introduction: Outerbridge-Kashiwagi procedure or ulnohumeral arthroplasty is a procedure for treating degenerative osteoarthritis of the elbow. Although a previous biomechanical study has demonstrated a decrease in maximum strength of the distal humerus after fenestration, there is limited literature reporting distal humerus fractures as a complication of this procedure. Case Report: We present an elderly woman with supracondylar humerus fracture that occurred after a low energy trauma six months after the Outerbridge-Kashiwagi procedure. Conclusion: The thin medial column after ulnohumeral arthroplasty was a possible reason for the supracondylar humerus fracture six months after the surgery. Surgeons should be especially careful during the fenestration to avoid the related complications.
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