Evaluation of medial patellofemoral ligament tears after acute lateral patellar dislocation: comparison of high-frequency ultrasound and MR

Abstract

• High-frequency ultrasound and MR were able to detect MPFL lesions after acute lateral patellar dislocation. • High-frequency ultrasound and MR showed similarly high accuracy in diagnosing MPFL lesions. • Interobserver agreement was very good for high-frequency ultrasound and good for MR.

Injury patterns of medial patellofemoral ligament and correlation analysis with articular cartilage lesions of the lateral femoral condyle after acute lateral patellar dislocation in children and adolescents: An MRI evaluation

“…Firstly, the injury patterns of the MPFL and articular cartilage lesions were not evaluated surgically but based on the MRIs only; therefore, we were unable to determine the accuracy of these MRI findings. Nonetheless, previous studies have shown that MRI is an accurate method for the diagnosis of the MPFL injury after acute LPD [4,5,8,11,17,22]. Our study results also showed that the interobserver agreement was good for the evaluation of injury types of the MPFL and very good for the evaluation of injury locations of the MPFL.…”

“…Injuries occurred simultaneously in more than one location of the MPFL were classified as combined injury [3,4,8,22]. Articular cartilage lesion was divided into chondral lesions and osteochondral lesions [23].…”

“…Using diagnostic classification criteria from Elias and Zhang [17,22], the MPFL injuries were divided into partial and complete tears. The manifestations of the partial MPFL tear were defined as thickening and irregularity of the contour, including discontinuity of normal fibres, and intra-ligamentous or extensive periligamentous oedema.…”

The Correlation between the Injury Patterns of the Medial Patellofemoral Ligament in an Acute First-Time Lateral Patellar Dislocation on MR Imaging and the Incidence of a Second-Time Lateral Patellar Dislocation

“…Patients were eligible for inclusion if they had suffered an acute, first-time LPD regardless of the injury mechanism. The inclusion criteria were as follows ( 17 18 19 20 21 ):…”

“…Using the diagnostic classification criteria from studies of Zhang et al and Balcarek et al ( 17 18 19 20 21 22 23 24 ), the degrees of MPFL injury were divided into partial and complete tears. The manifestations of a partial MPFL tear were defined as thickening and irregularity of the contour, including discontinuity of normal fibers, and intraligamentous or extensive periligamentous edema.…”