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| Application of dualsource CT imaging in diagnosis of anterior cruciate ligament injury |
| REN Rui1, SONG Qiong2, ZHANG Zhilong1, CHEN Liang3, ZHAI Changbin3* |
1 Department of Outpatient,Binzhou Medical University Hospital, Binzhou 256603,Shandong,P.R.China;
2 CCU,Binzhou Medical University Hospital;
3 Department of Radiology, Binzhou Medical University Hospital |
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Abstract Objective To evaluate the diagnostic accuracy of dual-source CT imaging in anterior cruciate ligament injury of knee joint by comparing the results of arthroscopy with anatomy and dual-source CT imaging. Methods Thirty-six patients with unilateral anterior cruciate ligament injury were treated with dual-source CT imaging.The original image is processed into MPR, RT and dual-energy images through post-processing software. CT density, length and starting point, middle and terminal ligament thickness of bilateral anterior cruciate ligament (ACL) were measured to locate the injury site of ACL. Arthroscopic examination was performed on the affected knee joints in 36 patients.The measurement values between the affected side and the normal side of the anterior cruciate ligament were measured by independent sample t test, with P<0.05, and the difference was statistically significant.Kappa analysis was used for the consistency of the two tests. Kappa values<0.20 were considered to be very low consistency, 0.21 to 0.40 general consistency, 0.41 to 0.60 medium consistency, 0.61 to 0.80 height consistency, and 0.81 to 1 almost identical. Results Thirty patients with unilateral anterior cruciate ligament injury were diagnosed by arthroscopy, and the coincidence rate, true positive rate, missed diagnosis rate, true negative rate and misdiagnosis rate of dual-source CT were 91.67%, 93.33%, 6.67%, 83.33% and 16.67%, respectively. The CT density, length, starting-point thickness, middle thickness and terminal thickness of the anterior cruciate ligament on the affected side (patients with ACL injury diagnosed by arthroscopy) were significantly different from those on the healthy side(P<0.05).Kappa test was used for arthroscopy and dual-source CT examination, with Kappa value of 0.719, and the two methods had consistency. Conclusion Dual-source CT imaging technology can be used as an important imaging auxiliary examination in the diagnosis of anterior cruciate ligament injury. Dual-source CT can preliminarily diagnose and locate the injury site of anterior cruciate ligament of knee joint by measuring the anterior cruciate ligament related imaging.
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Received: 12 June 2019
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