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| The shiny-corner sign of the tibial plateau medial condyle: MRI appearances and clinical significance |
1. Department of Radiology, Chinese Traditional Medicine Hospital of Danyang, Danyang Jiangsu 212300, China;
2. Department of Radiology, Nanjing General Hospital of Nanjing Military Command, Nanjing 210002, China |
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Abstract Objective: To describe the MRI findings of the shiny-corner sign of the tibial plateau medial condyle and to analysis its association with the medial meniscal-osteochondral unit. Methods: Clinical data and MRI findings of 209 patients with 227 knees MRI exams were performed, from January to May 2014, were analyzed retrospectively. Results: Seventy knees demonstrated a shiny-corner sign and 51 cases involved the medial rim of the medial tibial plateau, 12 cases involved the posterior rim in and the anterior rim in 7 cases. Patients with shiny-corner sign were older than patients without shiny-corner sign(mean age (59.75±13.52) years vs (47.86±15.02) years). The presence of a shiny-corner sign could detect a tear of the medial meniscus with a sensitivity, specificity, positive predictive value, and negative predictive value of 61%, 91%, 83%, and 76%, respectively. The shiny-corner sign was associated with tears of the medial meniscus and radial displacement of the meniscus in the knee(P<0.001). Conclusion: Shiny-corner sign of the knee is associated with tears of the menisci and according to this we believe the concept that the menisci had the function to protect the underlying covered portions of the tibial plateau.
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Received: 10 September 2015
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