Pain treatment after total hip arthroplasty:Detailed statistical analysis plan for the RECIPE randomised clinical trial

BACKGROUND: The RECIPE trial systematically investigates effects of different combinations of paracetamol, ibuprofen and dexamethasone for pain treatment after total hip arthroplasty. To preserve transparency, minimize risk of bias, and to prevent data-driven analysis, we present this detailed statistical analysis plan.METHODS: The RECIPE trial is a randomized, blinded, parallel four-group multicenter clinical trial for patients undergoing planned primary total hip arthroplasty. Interventions are initiated preoperatively and continued for 24 hours postoperatively. Primary outcome is total opioid consumption 0-24 hours after end of surgery. Primary analysis will be performed in the modified intention to treat population of all patients undergoing total hip arthroplasty, and all analyses will be stratified for site. We will perform pairwise comparisons between each of the four groups. The primary outcome will be analysed using the van Elteren test and we will present Hodges-Lehmann median differences and confidence intervals. Binary outcomes will be analysed using logistic regression. To preserve a family-wise error rate of DISCUSSION: The RECIPE trial will provide important information on benefit and harm of combinations of the most frequently used non-opioid analgesics for pain after primary hip arthroplasty.