INITIAL OUTCOMES OF POSTERIOR DYNAMIC DISTRACTION DEVICE COMPARED TO VERTEBRAL BODY TETHERING FOR ADOLESCENT IDIOPATHIC SCOLIOSIS

Non-fusion procedures are growing in use for the AIS treatment. Two devices received limited HDE approval for clinical use by the US FDA in 2019. Although treatment indications are similar, to our knowledge, there is no multicenter comparative study of the perioperative outcomes for these two devices. AIS patients who met FDA HDE criteria for PDDD were prospectively enrolled in this matched multicenter comparative study. Inclusion criteria were the diagnosis of Lenke 1/5 AIS, Cobb angle 35-60 degrees with correction to less than or equal to 30 degrees on lateral bend and minimal thoracic kyphosis. These patients were matched by age, gender, Risser score, curve type, and curve magnitude to a single-center cohort of prospectively enrolled VBT patients, and perioperative results were compared up to 1-year follow-up. Twenty-three PDDD patients were matched to 23 VBT patients. There was no difference in preoperative major Cobb angle (46 vs. 47 degrees, p=0.5), age (13.2 vs. 13.0, p=0.6), curve type (90% thoracic for both groups, p=1.0), Risser or gender. Mean blood loss was significantly higher in the VBT cohort (90 ml vs. 35 ml for PDDD, p=0.0064). Mean operative time was longer in the VBT cohort, 173 min vs. 113 min for PDDD (p Prospective perioperative outcomes demonstrate better index correction and reduced operative time, blood loss, and length of stay in PDDD compared to a matched cohort of VBT patients within one-year post-operation. Further data on long-term functional benefits and durability are needed.