Carta al director con relación al artículo: «Is the coronal plane alignment of the knee (CPAK) classification useful to plan individualized total knee arthroplasty surgery for the Spanish population? A critical analysis of the CPAK classification» V.J. León-Muñoz; J. Hurtado-Avilés; M. López-López; F. Santonja-Medina; J. Moya-Angeler;