A Novel MRI Mapping Technique for Evaluating Bone Bruising Patterns Associated With Noncontact ACL Ruptures

Area of Science:

• Orthopedic Surgery
• Radiology
• Sports Medicine

Background:

• Bone bruises in knee injuries are crucial for understanding anterior cruciate ligament (ACL) rupture mechanisms.
• A standardized magnetic resonance imaging (MRI) mapping technique for bone bruises is lacking.

Purpose of the Study:

• To develop and validate a novel MRI mapping technique for bone bruises in noncontact ACL injuries.
• To assess the reliability of the new technique for interrater and intrarater assessments.
• To determine if identified bone bruise patterns support common noncontact ACL injury mechanisms.

Main Methods:

• A cross-sectional study involving 43 patients with noncontact ACL injuries.
• Retrospective MRI review using a novel mapping technique combining ICRS and WORMS systems.
• Interrater and intrarater reliability assessed using intraclass correlation coefficient (ICC).

Main Results:

• High interrater (0.918) and intrarater (0.974) reliability for femoral edema mapping.
• High interrater (0.979) and intrarater (0.978) reliability for tibial edema mapping.
• Significant prevalence of bone bruises in the lateral femoral condyle and tibial plateau, with specific anterior/posterior localizations.

Conclusions:

• The novel combined mapping technique provides a reliable and standardized method for reporting bone bruises in ACL injuries.
• Identified bone bruise patterns align with established mechanisms of noncontact ACL injury, including valgus stress and tibial rotation.