Abstract #2272

A new method for accurate detection of cartilage lesions in femoroacetabular impingement using quantitative T2 mapping: preliminary validation against arthroscopic findings at 3 T

Noam Ben-Eliezer^1,2, Akio Ernesto Yoshimoto², KAI Tobias Block^1,2, Roy Davidovitch³, Thomas Youm³, Robert Meislin³, Michael Recht^1,2, Daniel K Sodickson^1,2, and Riccardo Lattanzi^1,2

¹Center for Advanced Imaging Innovation and Research (CAI2R), New York University School of Medicine, New York, NY, United States, ²Bernard and Irene Schwartz Center for Biomedical Imaging, Department of Radiology, New York University School of Medicine, New York, NY, United States, ³Department of Orthopedic Surgery, New York University Hospital for Joint Diseases, New York, NY, United States

Early diagnosis of cartilage defects is critical for the success of corrective surgical procedures in patients with femoroacetabular impingement (FAI). T₂ is a biomarker for early biochemical degeneration of cartilage, but in vivo T₂ mapping is challenging while commonly used techniques based on exponential fit of multi spin-echo protocols are inaccurate. We used a Bloch simulation based T₂ mapping technique – the EMC algorithm – to retrospectively quantify reliable T₂ values in the hip cartilage of FAI patients. We then defined a normalized T₂-index using an internal reference and showed that it allows detection of surgically confirmed cartilage lesions with 95% accuracy.

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