There are different definitions of Child Abuse, a concept currently replaced in medical literature as Non-Accidental Injuries (NAI). Chilean Law No. 19.324 on domestic violence defines it as “the result of an action or omission that produces damage to the physical or mental health of minors.” UNICEF understands it as children and adolescents up to 18 years of age who “occasionally or habitually suffer acts of physical, sexual or emotional violence, whether in the family group or in social institutions.” However, the most complete and specific definition is given by the WHO, which defines it as abuse and neglect of children under 18 years old and includes all types of physical or psychological abuse, sexual abuse, neglect, negligence, and commercial or other exploitation that cause or may cause harm to the health, development, or dignity of the child. The global prevalence of LNA varies according to the definition of the diagnosis used since broader definitions provide higher prevalence rates. There is also inconsistency in the reporting of cases in the world literature due to underdiagnosis. It is estimated that between 2% and 10% of children who are treated in emergency services have LNA, and it is estimated that 20% of LNA fractures in children under 3 years old are not diagnosed.