Modification of Objective Dejour Criteria Yields Excellent Diagnostic Accuracy for Pediatric Patellofemoral Instability

Application of the Dejour classification of trochlear dysplasia utilizing adult-specific thresholds yielded only moderate accuracy in the diagnosis of PFI in pediatric patients. The authors present an MRI-based classification system utilizing objective measurements of trochlear and patellofemoral morphology, emphasizing a 2-measurement combination of sulcus angle and LPFA that yielded excellent diagnostic accuracy. This new classification system is presented as a practical tool to objectively diagnose pediatric PFI in the clinical setting.