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Purpose To investigate the predictive value of talar head edema (THE) in acute ankle sprain for the presence of concomitant ligament injuries. Methods This retrospective study was approved by the ethics committee and informed consent was obtained. One hundred patients (mean age: 37 years ± 14 [standard deviation], range 13–77 years) with MRI of the ankle after acute trauma were included. The cohort in this matched-pair study consisted of 50 patients with THE (group 1) and 50 patients without THE (group 2). Two readers independently evaluated presence and size of bone marrow edema of the talus head and injuries of the lateral, medial, talonavicular, and spring ligament complex. Statistics included intraclass correlation coefficient (ICC) and Kappa statistics as well as parametric and non-parametric tests. Results On average, patients with THE demonstrated significantly more ligament injuries in comparison to patients without THE (3.7 vs. 1.3,  p  ≤ 0.01). Also, in patients with THE, the number of injured ligaments was significantly higher at the lateral ( p  = 0.03), medial ( p  ≤ 0.01), and talonavicular ( p  ≤ 0.01) compartment in comparison to patients without THE. The most frequently injured ligaments in patients with THE were the anterior talofibular ligament (60%) and the anterior tibiotalar ligament (42%). There was no significant correlation between edema size and the number of injured ligaments or compartments ( p  = 0.5). Conclusion THE is associated with more extensive ligamentous ankle injury, in particular to the medial and lateral collateral ligament complex, and therefore indicative of severe ankle trauma.

Bone marrow edema of the medioplantar talar head is associated with severe ligamentous injury in ankle sprain