PMC5827882_01
Coronal (a) and sagittal (b) T2-weighted metal reduction magnetic resonance images of the right knee, demonstrating an apparently intact ACL. Note the presence of metallic artifacts (white arrows) throughout the anterior and posterior aspect of the knee on the sagittal image.
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The images revealed an intact patellofemoral arthroplasty; however, evaluation of the ACL and menisci was nondiagnostic due to metallic susceptibility artifacts (Figures 1-3).
Coronal proton density with metal reduction MRI of the right knee demonstrates significant image distortion (white arrows) from metallic artifacts, obscuring accurate evaluation of the medial femoral condyle articular surface.
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The images revealed an intact patellofemoral arthroplasty; however, evaluation of the ACL and menisci was nondiagnostic due to metallic susceptibility artifacts (Figures 1-3).
Sequential sagittal T2-weighted metal reduction MR images of the right knee lateral compartment. The presence of metal artifacts (white arrows) obscures accurate evaluation of the lateral meniscus.
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fig3
The images revealed an intact patellofemoral arthroplasty; however, evaluation of the ACL and menisci was nondiagnostic due to metallic susceptibility artifacts (Figures 1-3).
Arthroscopic images of the right knee obtained with mi-eye 2. (a) An intra-articular loose body () is visualized in the anterior knee. (b) A large chondral defect () on the weight-bearing surface of the medial femoral condyle with complete loss of the articular cartilage and exposed subchondral bone. (c) A view of the intercondylar notch showing a tear of the ACL () with the remnant fibers of the femoral origin (arrows) along the lateral wall of the notch.
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fig4
Upon further examination, we discovered an ACL tear, an intra-articular loose body, and a grade IV chondral lesion on the medial femoral condyle measuring approximately 20 mm x 20 mm (Figure 4).