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Neck of femur fractures (NOF#) are common in Trauma and Orthopaedics and Avascular necrosis (AVN) is a major complication. Guidance advises fixation within 48 hours, with no separate guidance for under 60 years of age. We reviewed factors affecting the complication rate in intracapsular NOF#’s undergoing fixation under the age of 60. Methodology We retrospectively reviewed a 5 year cohort (2013-2017) of intracapsular NOF#’s with native femoral head retention. 49 patients were identified. The following were determined: • Time to fixation from presentation in ED - 0-6hrs, 6-12hrs, 12-18hrs, 18-24hrs, 24-48hrs, 48+hrs: • Fixation type - Cannulated screw (CS), Dynamic Hip Screw (DHS), DHS + CS: • Complications – AVN, Non-union: • Displaced/Undisplaced Results 31 were undisplaced, 18 displaced. 82% (N = 40) were treated with CS, 10% (N = 5) with DHS and 8% (N = 4) with DHS + CS. Overall 21% developed AVN and 10% developed non-union. After undisplaced fractures 19% developed AVN and 10% developed non-union. After displaced fractures 22% developed AVN and 11% developed non-union. 40 patients were fixed using CS, 20% developed AVN and 12.5% had non-union. AVN occurred in 20% of those fixed with a DHS and 25% fixed with DHS and CS. No AVN was identified in the 0-6 hr fracture fixation time range. Conclusion No patients receiving fixation in less than 6 hours went on to have AVN or non-union, with higher rates after this time. There was no difference in outcome regarding AVN when looking at different fixation methods. There was no difference in complications when comparing fracture displacement.

P25 AVN and complication rate following Intracapsular fracture Neck of Femur fixation in the under 60s. – Derby experience