The predictive value of MRI in the syndesmotic instability of ankle fracture

• Published in: Skeletal radiology Vol. 47; no. 4; pp. 533 - 540
• Main Authors: Park, Young Hwan, Yoon, Min A., Choi, Won Seok, Choi, Gi Won, Hong, Suk Joo, Kim, Hak Jun
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.04.2018; Springer; Springer Nature B.V
• Subjects: Adolescent; Adult; Ankle; Ankle Fractures - diagnostic imaging; Ankle Fractures - physiopathology; Diagnostic systems; Exercise Test; Female; Fluoroscopy; Humans; Imaging; Joint Instability - diagnostic imaging; Joint Instability - physiopathology; Ligaments; Magnetic resonance imaging; Magnetic Resonance Imaging - methods; Male; Medicine; Medicine & Public Health; Middle Aged; NMR; Nuclear magnetic resonance; Nuclear Medicine; Orthopedics; Pathology; Patients; Predictive Value of Tests; Radiology; Reproducibility of Results; Scientific Article; Sensitivity; Sensitivity and Specificity; Stability; Stability analysis; Stresses; Tearing; Syndesmotic instability; Intraoperative stress test; Magnetic resonance imaging; Ankle fracture
• ISSN: 0364-2348; 1432-2161
• DOI: 10.1007/s00256-017-2821-4

Objective Although many types of ankle fracture can be combined with syndesmosis injury, preoperative imaging studies rarely reveal instability of the syndesmosis. This study assessed the use of magnetic resonance imaging (MRI) for syndesmotic instability in patients with unstable ankle fracture. Methods A total of 74 patients who were treated for Lauge-Hansen supination external rotation/Weber B type fracture or pronation external rotation/Weber C type fracture and who underwent MRI for preoperative assessment were enrolled. The MRI findings of the syndesmotic ligament and the results of an intraoperative stress test were evaluated. Results Twenty-six patients had a positive result on the intraoperative stress test for syndesmotic instability. The MRI findings of the syndesmotic ligaments revealed that complete tear of the posterior inferior tibiofibular ligament (PITFL) was the most reliable predictor of syndesmotic instability (sensitivity, 74%; specificity, 78%; positive predictive value, 54%). Interobserver agreement for the intraoperative stress test and MRI assessment was excellent, except for the MRI findings of the interosseous ligament (62% agreement; kappa, 0.3). Conclusions Complete tear of the PITFL on MRI has additional diagnostic value for syndesmotic instability in ankle fracture. However, because the sensitivity might not be sufficient to justify the costs associated with MRI, cost-effectiveness should be considered.