Value of 30° flexed knee MRI in evaluating anterior cruciate ligament tears
10.13929/j.1003-3289.201811027
- Author:
Xiao JIN
1
Author Information
1. Department of Radiology, Peking University Third Hospital
- Publication Type:Journal Article
- Keywords:
Anterior cruciate ligament;
Knee joint;
Magnetic resonance imaging
- From:
Chinese Journal of Medical Imaging Technology
2019;35(5):754-758
- CountryChina
- Language:Chinese
-
Abstract:
Objective: To investigate the value of 30° flexed knee MRI in evaluating anterior cruciate ligament (ACL) tears. Methods Totally 64 knee trauma patients who underwent arthroscopy were included. Knee MRI in slightly flexed (about 17°) and 30° flexed positions were successively performed in all patients. The delineation of ACL full length, double-bundle structure and torn ACL's disrupted sites combined with ligament remnants were rated separately by 2 radiologists. Taken arthroscopy results as golden standards, the sensitivity, specificity and accuracy were calculated. Results: The diagnosing sensitivity, specificity and accuracy of ACL tears were 97.44% (38/39), 100% (25/25) and 98.44% (63/64) respectively in slightly flexed knee MRI, while they were all 100% in 30° flexed knee MRI. There was good consistency between the two positions (Kappa=0.967). MRI of 30° flexion was superior to slightly flexion in delineation of ACL full length and torn ACL's disrupted sites combined with ligament remnants (both P<0.001), while no statistical difference was found in the delineation of ACL double-bundle structure (P=0.223). Conclusion: Both slightly flexed and 30° flexed knee MRI have high sensitivity, specificity and accuracy in diagnosing ACL tears, whereas 30° flexion MRI is superior to slightly flexion images in delineation of ACL and its tears.
