Zhang, R. and Lu, S. (2026) “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, 97, pp. 395–396. doi: 10.2340/17453674.2026.46139.