DOS 2019

182 · DOS Abstracts Are magnetically controlled growing-rod lengthening procedures in early-onset scoliosis patients pain-free? Simon Toftgaard Skov, Haisheng Li, Jan Duedal Rölfing, Marianne Vigh-Larsen, Cody Bünger Elective SurgeryCenter, SilkeborgRegional Hospital ; Department of Orthopaedic Surgery, Aarhus University Hospital; Department of Surgery & Anesthesiology, Aarhus University Hospital; Background: Magnetically controlled growing-rods (MCGRs) have gained pop- ularity because they offer non-surgical lengthening procedures in early-onset scoliosis (EOS) instead of semi-annual open surgery elongations with traditional growing rods. Many aspects of MCGR treatment have been investigated, but pain in conjunction with distraction is only sparsely described in the literature. Purpose / Aim of Study: The aim was to investigate the pain associated with MCGR lengthening procedures. Materials and Methods: Prospective cohort study assessing pain intensity of 25 EOS patients before, during and after MCGR lengthening procedures in an outpatient setup. They underwent at least two (range 2-16) lengthening procedures prior to this study. The pain intensity was estimated using patient- reported Faces Pain Scale (FPS-R), caregiver-reported pain numeric rating scale (NRS), and NRS and revised Face, Legs, Activity, Cry, Consolability scale (r-FLACC) by two medically trained observers. The inter- rater reliability and correlation between instruments were analyzed. Findings / Results: 23 of 25 EOS patients (8-16 years old) with mixed etiol- ogy were able to self-report pain. The average pain intensity was mild, median 1 (range 0-6) on all four instruments on a 0-to-10 scale. Afterwards, 22 patients (88%) were completely pain-free and the remaining 3 patients had a pain score of 1. MCGR stalling (i.e. clunking) was encountered in 56% of the patients with- out impact on the pain intensity. Conclusions: The average maximum pain intensities during the lengthening procedures were mild and pain ceased within few minutes. Inter-rater reliability was good to excellent for NRS and r-FLACC, and there were high correlations between all the four instruments, indicating high criterion validity. 138.