Ankle fractures frequently associate tibiofibular syndesmosis injuries, whose diagnosis allows intraoperative treatment that can prevent mid-long term complications. There are several clinical diagnostic tests and specific projections but they are difficult to interpret and standardize. The objective of the study is to evaluate a recently described intraoperative diagnostic test. We conducted the test by intraarticular contrast injection in ten patients with fractures type Weber B or C. The test was valuable in 8 cases and the result coincided with the other clinical test used. We detected a fracture in one case that had gone undetected and resulted in a change of treatment. There were no complications. Using a reproducible, cheap and safe test, we can obtain an easily interpretable image that complements the rest of clinical tests to support the surgeon in the decision to fix the sindesmosis in ankle fractures.