The MEPI (Modified Elbow Performance Index) or MEPS (Modified Elbow Performance Score) is a multidimensional assessment scale for elbow pain and function. This score is widely used in scientific literature, particularly for post-traumatic and post-operative evaluation, including in many French-language studies. However, no French translation of this score has undergone quality criteria verification and validation in a pediatric population.

Inclusion Criteria:

• Pre-test volunteer group:
• Patients aged 4 to 17 years followed in the department without an elbow injury
• Follow-up schedule compatible with the study protocol
• No objection from a parent or legal guardian, with the child's consent if age permits
• Test volunteer group:
• Patients aged 4 to 17 years followed in the department with a diagnosis of an elbow injury
• Follow-up schedule compatible with the study protocol
• No objection from a parent or legal guardian, with the child's consent

Exclusion Criteria:

• Pre-test volunteer group:
• Language barrier, lack of understanding of French
• Refusal to participate
• Confounding factor impairing function
• Opposition of parent or legal guardian and/or refusal of child if age permits
• Test volunteer group:
• Language barrier, lack of understanding of French
• Refusal to participate
• Confounding factor impairing function
• Opposition of parent or legal guardian and/or refusal of child if age permits