Comparison of outcomes after different methods of fixation for extracapsular hip fractures: An observational study

Optimal management of intertrochanteric fractures using either sliding hip screws (SHS) or Intramedullary nail (IMN) fixation has long been disputed and the optimal length of a 'short nail' has yet to be clarified. Our aim was to investigate functional outcomes in patients who have undergone either sliding hip screw fixation or intramedullary fixation using varied lengths of nails to assess potential superiority. We retrospectively reviewed data from consecutive patients with trochanteric hip fractures between January 2010 - July 2019. Fracture fixation was performed with four different devices; SHS, 220mm and 175mm Targon PFT nails or 180mm Short Affixus Hip Fracture Nails. There was no significant difference in the patient demographics in each treatment group. Main outcome measures: Patients were followed up for 1 year post operatively to determine if there were differences in mobility and pain with the different fixation methods. There was no significant difference in the overall complication rate between methods of fixation. Overall Intramedullary nail fixation resulted in an improved mean pain score compared to SHS (mean difference 0.25, 95% CI 0.11 - 0.39, p=0.0005). On sub-analysis this was only statistically significant in 220mm Targon nails (mean difference 0.35, CI 0.19-0.57, p=0.0010) and not for the other two nails. In addition, there was a significant difference in mobility score (mean difference 0.38, CI 0.12-0.63, p=0.0036). On sub-analysis this was only statistically significant favouring the for 220 mm Targon nail (mean difference 0.57, CI 0.27-0.87, p=0.0002). We advise caution in interpreting the results of studies between different nails and SHS, as not all nails appear to be the same. Design features of modern nails such as length, proximal diameter, the use of a compression screw, lag screw interface within the nail and valgus inclination may all play a role in functional outcomes.