4th World ArthroplastyCongress (WAC). 18 y 19 de Abril 2024 en Madrid Integration of Square Fiducial Markers in Patient-SpecificInstrumentation and Their Applicability in Knee Surgery The Accuracy and Absolute Reliability of a Knee Surgery Assistance System Based on ArUco-Type Sensors Early Identification and Treatment of Trochlear Knee Dysplasia