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| MRI Imaging Features and Diagnostic Value in Patients with Cruciate Ligament Injuries of the Knee |
| DAI Chengzhong, WANG Haodong |
| Sichuan Orthopedic Hospital, Sichuan Chengdu 610041, China |
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Abstract Objective: To observe imaging features of MRI in patients with anterior cruciate ligament (ACL) injury of knee joint, and to analyze their diagnostic value.Methods: This study included 109 patients with knee joint injuries treated at our hospital from March 2020 to December 2023. All patients underwent MRI and arthroscopy, with arthroscopy serving as the "gold standard." Patients were divided into an ACL group and a non-ACL group. The MRI imaging features (direct and indirect signs) of both groups were compared. Kappa consistency analysis was used to evaluate the diagnostic value of each imaging feature for ACL injuries, and sensitivity and specificity were calculated.Results: Arthroscopy revealed 46 cases of ACL injuries, including 32 complete tears, 9 partial tears, and 5 tibial avulsions. There were significant differences between the ACL group and the non-ACL group in three direct signs (ACL discontinuity, abnormal course, and edema and thickening) and ten indirect signs (Blumensaat angle, PCL angle, PCL index, bone contusion, notch sign, anterior tibial displacement, uncovered posterior horn of the meniscus, empty intercondylar notch sign, single-layer display of the lateral collateral ligament, and single-layer display of the PCL) (P<0.05). Kappa consistency analysis showed that among the direct signs, the abnormal course had the highest Kappa consistency (Kappa=0.790, P<0.001), and among the indirect signs, Blumensaat angle had the highest Kappa consistency (Kappa=0.569, P<0.001). Sensitivity was highest for the direct sign of abnormal course, while specificity was highest for the indirect sign of empty intercondylar notch sign (P<0.05).Conclusion: MRI imaging features of ACL injuries are distinct, with primary signs being edema and thickening, and abnormal course. The indirect sign of Blumensaat angle can serve as a primary diagnostic basis, while the indirect signs of empty intercondylar notch sign, notch sign, and single-layer display of the PCL can serve as key auxiliary indicators.
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2024, Vol. 30 
