The Importance of Medial Patellar Shape as a Risk Factor for Recurrent Patellar Dislocation in Adults

Area of Science:

• Orthopedics
• Biomechanics
• Medical Imaging

Background:

• Lateral patellar dislocation (LPD) research often overlooks patellar morphology.
• Understanding patellar shape is crucial for assessing LPD risk.

Purpose of the Study:

• To determine if patellar morphology is a risk factor for recurrent LPD.
• To investigate if specific patellar measurements can differentiate patients with recurrent LPD from controls.

Main Methods:

• A cohort study compared 21 adults with recurrent LPD to 21 matched controls.
• Three-dimensional MRI scans were used to measure various patellar and knee joint parameters.

Main Results:

• Patients with recurrent LPD showed significantly reduced medial patellar width, total width, and volume.
• Medial patellar width was the strongest single predictor of recurrent LPD, achieving 83.3% accuracy.

Conclusions:

• Reduced medial patellar width is a key indicator for recurrent LPD.
• Assessing medial patellar morphology can improve LPD risk assessment and treatment planning.