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Background: Most rib fractures are treated conservatively, but patients with severe trauma may require surgical treatment. We report a rare case of delayed pericardial injury due to a fractured rib stump. Case presentation: A 61-year-old man fell while riding a bicycle and was transferred to our hospital. A computed tomography (CT) scan showed mild rib fractures on the 4th-6th ribs, and he was hospitalized because of acute pain. A few days later, his respiratory condition had worsened. CT showed that the rib fractures progressed significantly, and the stump was in contact with the heart, so we performed an urgent surgical rib fixation. Operative findings revealed intrathoracic hemorrhage by the pericardial laceration because of the rib stump. The 4th-7th ribs were internally fixed using a screwless titanium metal plate, and he was discharged without complications on the 20th postoperative day. Conclusion: We experienced a rare case of pericardial injury caused by a rapid dislocation of rib fractures. Urgent surgical treatment was able to prevent a serious complication. Keywords: Chest trauma, Rib fracture, Surgical rib fixation, Emergency thoracotomy, Hemothorax