Objective: To evaluate magnetic resonance imaging (MRI) findings of medial meniscal root tear and the correlation of medial meniscal root tear with other associated knee abnormalities.
Methods: We retrospectively assessed preoperative magnetic resonance images of 39 patients with arthroscopically confirmed medial meniscal root tear. Magnetic resonance imaging findings were retrospectively reviewed by 2 experienced musculoskeletal radiologists for consensus. We evaluated the configuration of meniscal root tear and the other associated knee abnormalities on MRI for direct correlation with arthroscopic findings.
Results: At arthroscopy, there were 36 radial tears and 3 complex tears involving the medial meniscal posterior horn roots. All 36 radial tears could be correctly diagnosed by MRI, with findings showing ghost sign on sagittal images in 100% (36/36), vertical linear defect on coronal images in 100% (36/36), and radial linear defect on axial image in 94% (34/36). However, all 3 complex tears were misdiagnosed as radial tears on MRI. Medial meniscal root tears displayed a strong association with degenerative joint disease in 97% (38/39). Medial meniscal root tears were also found in association with cartilage defects of the medial femoral condyle and medial meniscal extrusions (≥3 mm) in 89% (34/38) and 67% (26/39), respectively.
Conclusions: Medial meniscal root tears were usually posterior horn root radial tear. A high association with degenerative joint disease, cartilage defects of the medial femoral condyle, and medial meniscal extrusions (≥3 mm) were also noted.
From the *Department of Diagnostic Radiology, Seoul Paik Hospital, Inje University College of Medicine; †Department of Radiology, Eulji Hospital, Eulji University School of Medicine; and ‡Department of Orthopedic Surgery, Seoul Paik Hospital, Inje University College of Medicine, Seoul, Korea.
Received for publication March 26, 2007; accepted May 30, 2007.
Reprints: Jae-Chan Shim, MD, Department of Diagnostic Radiology, Seoul Paik Hospital, Inje University College of Medicine, no. 85, 2-Ka, Jur-Dong, Chung-Gu, Seoul 100-032, Korea (e-mail: email@example.com).