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MRI Evaluation of Traumatic Bony and Chondral Lesions of the Knee Michael Farrell, MD-Laguna Hills, California; Kent Adamson, MD, J. Waldman, MD, A. E. Stauffer, MD, S. L. Zide, MD-Mission Viejo, California

We retrospectively reviewed 100 consecutive patients who underwent MRI of the knee, followed by arthroscopic (97) or open knee surgery (3). The MRI, plain radiographs, and arthroscopic findings were compared. Using a General Electric 1.5 Tesla MR and a dedicated cylindrical extremity coil, 5 mm Tl-weighted coronal, 3 mm T2-weighted sagittal, and 5 mm T2-weighted axial images were performed. The second echo of the T2 series was used to identify fluid, cartilage defects, and hemorrhage. In comparison to other planes the axial projection clearly identified patellar and trochlear groove lesions. Apart from knee effusions the plain radiographs were interpreted as normal in all cases. Review of the MR diagnosis compared to arthroscopic findings demonstrated 26/29 (89%) of meniscal tears, 14/15 (93%) of ACL tears, and patellar subluxation in 5/5 (100%). Clinically and arthroscopically unsuspected lesions were identified in 13% of patients. These included three cases of osteochondritis dissecans, five femoral or tibial nondisplaced cortical-trabecular fractures, three nondisplaced tibial pla-