Longitudinal evaluation of cartilage repair tissue after microfracture using T2-mapping: a case report with arthroscopic and MRI correlation |
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Authors: | José M Mejía Oneto Jutta Ellermann Robert F LaPrade |
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Institution: | (1) Orthopaedic Biomechanics Laboratory, Department of Orthopaedic Surgery, University of Minnesota, 2450 Riverside Avenue South, R200, Minneapolis, MN 55454, USA;(2) Center for Magnetic Resonance Imaging, Department of Radiology, University of Minnesota, 2450 Riverside Avenue South, R200, Minneapolis, MN 55454, USA;(3) Biomechanics Research Department, Steadman Philippon Research Institute, 181 W. Meadow Dr, Suite 400, Vail, CO 81657, USA; |
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Abstract: | A man sustained a left knee injury which led to full-thickness chondral defects of the trochlear groove and lateral femoral
condyle. Both areas were treated with microfractures and evaluated at 5 months and 2 years with standard MRI scans, T2 relaxation
maps, and arthroscopy. At 5-months post-microfracture repair, the patient complained of recurrent anterior knee pain. While
standard MRI imaging was inconclusive with regards to a potential recurrent defect at the trochlear groove microfracture area,
T2 relaxation maps established the integrity of the surface layer which was confirmed by arthroscopic evaluation. At 2 years,
imaging studies revealed repair tissue loss with low T2 values at the trochlear repair site. The failure of the trochlear
site and the integrity of the lateral femoral condyle repair sites were confirmed by arthroscopy. This case report is the
first one to provide a correlation of T2 mapping MRI findings with arthroscopic confirmation in the context of microfracture
repairs. The study provides evidence for the clinical utility of T2 relaxation maps for the postoperative assessment of microfractures
and raises the potential for T2 mapping MRI as a tool to evaluate these repair procedures. |
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