Cobalt chromiun-Titanium rods versus Titanium-Titanium rods for treatment of adolescent idiopathic scoliosis, which type of rod has better postoperative outcomes?

Abstract

OBJECTIVE; Compare the outcome of spinal deformity correction between Ti-Ti and CrCo-Ti rods for the treatment of spinal Adolescent Idiopathic Scoliosis (AIS) using rods mentioned with all pedicle screws and translation technique. METHOD; 59 patients operated for spinal deformity (Lenke 1 or 2) AIS. The patients were divided into two groups by random allocation using Ti-Ti rods (n = 29) and CrCo-Ti rods (n = 30) and the alone difference among them in the surgical procedure was rod material (Ti-Ti or CrCo-Ti rods) and finally, radiological outcomes were compared preoperatively, postoperatively and at last follow-up for 12 months. RESULTS; Patients' main curve correction after surgical procedure regardless type of rod was 48.95 +/- 11.04 (13-75) degree. Success rate of spinal deformity correction following surgical procedure regardless of type of administered rod was 86.76 +/- 11.30 percent (62.5-100). Mean of deformity correction rate was 91.49 +/- 10.67 using CrCo-Ti rods versus 81.86 +/- 9.88 using Ti-Ti rods (P-value=0.01). Angle change was 3.29 +/- 6.60 for kyphosis angle and 0.59 +/- 7.76 for lordosis angle. Rate of main curve correction was not significantly different considering patients' gender (P-value0.657). Main curve correction success rate was in association with patients' age and type of rod (P-value=0.054, r=-1.863 and P-value=0.001, r=8.865 respectively). CONCLUSION; CrCo-Ti rods have the ability to produce higher correction rates in AIS compared to Ti-Ti rod of the same diameter. CrCo-Ti rods provide significant and stable spinal correction, especially in correction of main curve. This rate was associated with patients' age and type of rod administered but not gender.