Medial Patellofemoral Ligament Injury And Associated Pathology In Acute Lateral Patella Dislocation: An MRI Study

Objective: To evaluate medial patellofemoral ligament injury position, injury extentand associated pathology diagnosis value using Magnetic Resonance Imaging. Methods:A retrospective analysis of49cases of acute lateral patellar dislocation with the finaldiagnosis in patients with MRI data.The MRI images were reviewed by two independentobservers for location of MPFL injury and extent, bone marrow edema, cartilage fracture,injury of the medial collateral ligament, meniscus injury, joint effusion and othercombined injuries. Results: The Tear of the MPFL at the femoral attachment occurred in23/49knees (46.9%), at the patellar attachment in12/49(24.5%) knees, and at themid-substance sites in8/49knees (16.3%), Attenuation of the MPFL without ruptureoccurred in6/49knees (12.3%). MRI evaluation of medial patellofemoral ligament: injuryin5cases were ranked as degree I,31cases were ranked as degree II,7cases were rankedas degree III. Associated findings, included marrow edema in42/49(85.7%), cartilagefractures in24/49(49%), medial collateral ligament sprains/tears in9/49(18.4%),meniscus tears in8/49(16.3%), joint effusion in49/49(100%), involved vastus medialisobliquus in25/49(51%), vastus lateralis in21/49(42.8%), lateral patellar retinaculum in10/49(20.4%).Conclusion: MRI can noninvasively determine medial patellofemoralligament injury position, injury extent, and associated pathology.for the clinician treatingplan provides the basis for.