Abstract
Triplane fractures of the adolescent ankle commonly require operative management. A number of classification systems exist showing a variety of fracture patterns, making fixation planning complex. Our institute has previously presented a classification system that simplifies the fracture pattern. Our aim was to find a fixation method that could be used in all cases.
We devised a universal screw trajectory for the epiphyseal fracture based on a partially threaded screw placed medial-to-lateral at 20 degrees to the inter-malleolar axis of the ankle. We retrospectively reviewed the axial CT images of 59 consecutive operatively managed triplane fractures from a single institute to simulate the placement of the screw.
In all 59 subjects, the simulated universal screw placement was in a satisfactory position to adequately, and safely, reduce the fracture. Two cases were classified as ‘Tillaux variants’, which are classically managed with a lateral-to-medial screw, but they were deemed to be potentially suitable for the universal screw, indeed in one case the treating surgeon used a medial-to-lateral screw and had a successful outcome.
Our classification system demonstrates a reproducible fracture line that is amenable to a universal screw fixation method in the world's largest published triplane series. It offers a low-tech solution to a difficult problem. This could simplify the preoperative plan and obviate the need for a CT scan, which is relevant to departments treating populations without access to such resources.
