Crescent fractures of the pelvis treated by open reduction and internal fixation: a critique of Day's guidelines.

INTRODUCTION: Day's classification and treatment guidelines are considered the gold standard in crescent fractures of the pelvis. The objective of this study was to retrospectively evaluate 10 surgically treated crescent fractures of the pelvis in the context of Day's recommendations.

METHODS: This is a retrospective cohort study. Ten consecutive cases of crescent fractures that were treated surgically at a level 1 trauma center formed the cohort. Six were operated anteriorly, three posteriorly and one percutaneously. Classification and treatment strategy were compared to Day's guidelines. The minimum follow-up was 13 months. Outcomes were assessed using the modified Majeed's scoring system.

RESULTS: Three out of 10 cases were difficult to classify by Day's criteria. There were 4 type I, three type III and no type II cases. Our surgical strategy was independent of Day's recommendations in this series and based on ease of access, ability to restore the sacroiliac joint anatomy and other associated injuries. All the patients were mobilized early and the fractures united without any major incident. The results of these cases were quite good with outcome scores over 67/96.

CONCLUSIONS: Assigning Day's classification to a given case can be difficult in up to 33% patients with crescent fractures due to the obliquity of the iliac fracture line in axial sections. Sacroiliac articular alignment is the primary factor determining the surgical approach. Besides the fracture configuration, additional factors like delay in surgery, locking of the fracture fragments, comminution of the iliac or sacral fragment as well as access to the additional injuries contribute to the decision making.