Assessing Lateral Patellofemoral Dislocations on MRI: A Novel Contusion Grading Approach for Predicting Recurrence...

Area of Science:

• Orthopedic surgery
• Radiology
• Sports medicine

Background:

• Lateral patellar dislocations often involve bony contusions.
• Understanding the prognostic value of these contusions is crucial for patient management.

Purpose of the Study:

• To evaluate the relationship between the location of lateral patellofemoral bony contusions on MRI and recurrent patellar dislocation.
• To assess the association between contusion characteristics and the need for surgical intervention.

Main Methods:

• Retrospective cohort study of 235 patients with MRI-confirmed lateral patellar dislocations.
• Utilized a novel MRI-based grading system for bony contusions.
• Compared outcomes of nonoperatively managed patients with those requiring surgery.

Main Results:

• Bony contusions were present in 66.8% of patients, predominantly on the lateral femoral condyle.
• Contusion location did not significantly correlate with the need for surgical intervention (p=0.364).
• The presence of a bony contusion significantly predicted reinjury (p=0.003), with 86% of reinjured patients showing contusions.

Conclusions:

• The presence of lateral patellofemoral bony contusions on MRI is a significant predictor of recurrent patellar instability.
• Contusion location does not appear to influence the likelihood of surgical intervention.
• A novel MRI grading system may aid in stratifying patients with lateral patellar dislocations.