Lateral Femoral Condyle Angle Is an Anatomic Risk Factor for Anterior Cruciate Ligament Primary Injury and Secondary...

Area of Science:

• Orthopedic surgery
• Biomedical engineering
• Radiology

Background:

• Anterior cruciate ligament (ACL) injuries pose significant challenges in sports medicine.
• Predictive markers for ACL injury risk and graft failure are crucial for patient management.
• The lateral femoral condylar angle (LFCA) is a novel parameter for assessing femoral condyle morphology.

Purpose of the Study:

• To define the lateral femoral condylar angle (LFCA).
• To evaluate the predictive capacity of LFCA for primary and recurrent ACL injuries.
• To assess LFCA's role in conjunction with other imaging parameters.

Main Methods:

• Retrospective case-control study involving 540 patients (18-50 years).
• Patients were categorized into primary ACL injury, ACL graft rerupture, and ACL-intact control groups.
• LFCA and 38 other parameters were measured using preoperative 3.0-T MRI scans.
• Statistical analyses included ANOVA, multivariate regression, and ROC analysis.

Main Results:

• A significant gradient in LFCA was observed across controls, primary injuries, and reruptures (P < .001).
• LFCA independently predicted primary ACL injury (AUC=.576) and rerupture (AUC=.704).
• Combined models incorporating LFCA with other parameters achieved higher predictive accuracy (AUC up to .847 for primary injury, .817 for rerupture).

Conclusions:

• LFCA is an independent predictor of ACL injury.
• LFCA demonstrates significant predictive value for graft rerupture, particularly in Asian patients.
• Integrating LFCA with other imaging parameters enhances ACL injury prediction.