Durability and Failure Types of S2-Alar-Iliac Screws: An Analysis of 312 Consecutive Screws

S2-alar-iliac screws improve stability across the lumbosacral junction in spinopelvic fixation procedures by crossing the cortical surfaces of the sacroiliac joint, thereby increasing the biomechanical strength of the instrumentation

Seung-Jae Hyun

2020

Scholarcy highlights

  • S2-alar-iliac screws improve stability across the lumbosacral junction in spinopelvic fixation procedures by crossing the cortical surfaces of the sacroiliac joint, thereby increasing the biomechanical strength of the instrumentation
  • There were no significant differences in screw diameter, length, or insertion angle between right-side and left-side screws
  • Set screw dislodgement occurred in 7 screws
  • Screw fracture occurred in 6 screws: 5 neck fractures and 1 shaft fracture
  • SIJ irritation symptoms after S2AI screw fixation occurred with considerable frequency

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