• Diederik T Meijer, de Muinck Keizer Robert-Jan O RO Trauma Unit, Department of Surgery, Academic Medical Center, Amsterdam, the Netherlands., Stufkens Sjoerd A S SAS Department of Orthopaedic Surgery, Academic Medical Center, Amsterdam, the Netherlands., Tim Schepers, Inger N Sierevelt, Kerkhoffs Gino M M J GMMJ Department of Orthopaedic Surgery, Academic Medical Center, Amsterdam, the Netherlands. , Goslings J Carel JC Department of Surgery, Onze Lieve Vrouwe Gasthuis (OLVG), Amsterdam, the Netherlands., and Job N Doornberg.
• Department of Orthopaedic Surgery, Academic Medical Center, Amsterdam, the Netherlands.
• J Orthop Trauma. 2019 Aug 1; 33 (8): 404-410.

ObjectiveTo correlate Q3DCT measurements of residual step-off, gap, and 3D multidirectional displacement of postoperative posterior malleolar fracture fragment reduction in patients with rotational type ankle fractures, with patients' clinical outcome using standardized patient- and physician-based outcome measures.DesignProspective cohort study.SettingLevel-I Trauma Center.PatientsThirty-one patients with ankle fractures including a posterior malleolar fracture (OTA/AO type 44) were included.InterventionAll patients underwent open reduction internal fixation of their ankle fracture, of which 18 patients (58%) had direct fixation of the posterior malleolar fragment. Decision of (direct) fixation of the posterior malleolar fragment was not standardized and guided by surgeons' preference.Main Outcome MeasurementsQuality of postoperative reduction was quantified using Q3DCT: posterior fragment size (% of joint surface), residual step-off (mm), postoperative gaps (mm), and overall multidirectional displacement were quantified. Foot and Ankle Outcome Score pain and symptoms subscales and quality of life (Short Form-36) at 1 year postoperatively were included as the main outcome measures.ResultsStep-off (mean 0.6 mm, range 0.0-2.7, SD 0.8) showed a significant correlation with worse Foot and Ankle Outcome Score pain and symptoms subscales. Residual fracture gap (mean 12.6 mm, range 0.0-68.8, SD 19.5) and 3D multidirectional displacement (mean 0.96 mm, range 0.0-2.8, SD 0.8) showed no correlation.ConclusionsIn patients with rotational type ankle fractures involving a posterior malleolar fracture, contemporary Q3DCT measurements of posterior fragment size and residual intra-articular step-off-but not gap-show significant correlation with patient-reported pain and symptoms.Level Of EvidencePrognostic Level II. See Instructions for Authors for a complete description of levels of evidence.

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