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Related Experiment Video

Updated: Mar 23, 2026

A Teleoperated Robotic System-Assisted Percutaneous Transiliac-Transsacral Screw Fixation Technique
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Modified iliac screw fixation: technique and clinical application.

Seil Sohn1,2,3,4, Chun Kee Chung5,6,7, Yongjung Jay Kim8

  • 1Department of Neurosurgery, Seoul National University College of Medicine, 101 Daehak-no, Jongno-gu, Seoul, 110-744, Korea.

Acta Neurochirurgica
|March 24, 2016
PubMed
Summary

A novel modified iliac screw fixation technique offers an effective alternative for sacropelvic fixation in adult patients, avoiding common complications associated with traditional methods.

Keywords:
S2 alar iliac fixationSacropelvic fixationSpinal deformitiesSpine

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Area of Science:

  • Spine surgery
  • Orthopedic surgery
  • Biomechanical engineering

Background:

  • Conventional iliac bolt and S2 alar iliac screw (S2AI) are common sacropelvic fixation methods.
  • Iliac bolt requires a lateral connector and can cause prominent screw heads.
  • S2AI technique is associated with a high rate of instrument failure.

Purpose of the Study:

  • Introduce a modified iliac screw fixation technique.
  • Evaluate its clinical application and outcomes in adult patients.

Main Methods:

  • The modified technique uses an entrance site 1 cm medial and 1 cm caudal to the posterosuperior iliac spine.
  • Ten adult patients underwent fixation between 2009 and 2015.
  • Minimum 12-month follow-up (mean 30.7 months) with radiographic and clinical assessment.

Main Results:

  • Significant postoperative improvement in C7 plumb line (SVA).
  • No screw breakage, prominent screw heads, or implant removal required during follow-up.
  • SVA remained stable between immediate postoperative and final follow-up.

Conclusions:

  • The modified technique eliminates the need for a lateral connector and avoids prominent screw heads.
  • It circumvents the acute screw head-shaft angle seen in S2AI.
  • This modified approach is a viable and effective alternative for sacropelvic fixation.