Zhang, Rui, and Sheng Lu. “A 3-Mm Protrusion Threshold After Pediatric Forearm ESIN: a Rule-Out Safety Margin, Not a Decision Rule: Letter to the Editor: Long-Term Implant Retention After Impacted Elastic Stable Intramedullary Nailing in Pediatric Diaphyseal Forearm Fractures”. Acta Orthopaedica, vol. 97, June 2026, pp. 395–396, doi:10.2340/17453674.2026.46139.