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Related Experiment Video

Updated: Oct 22, 2025

C-arm-Free Simultaneous OLIF51 and Percutaneous Pedicle Screw Fixation in a Single Lateral Position
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Preliminary experience using S1-alar iliac fixation with navigation: technical note.

Bo Li1,2, Andrew K Chan1, Praveen V Mummaneni1

  • 11Department of Neurosurgery, University of California, San Francisco, California; and.

Journal of Neurosurgery. Spine
|August 27, 2021
PubMed
Summary
This summary is machine-generated.

The novel S1-AI screw fixation offers single-screw sacral and iliac fixation, reducing dissection and simplifying rod connection for pelvic fixation in degenerative conditions. Further research is needed to validate its long-term efficacy without anterior lumbar interbody fusion.

Keywords:
S1-AIS2-AIalailiumpelvic fixationsacral-alar-iliacsacrumsurgical technique

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Area of Science:

  • Spine surgery
  • Orthopedic surgery
  • Surgical techniques

Background:

  • Traditional pelvic fixation methods include iliac screws and S2-alar iliac (S2-AI) screws.
  • Surgeons often opt for S1 screws alone in degenerative conditions without severe deformities.
  • Existing methods involve significant muscular dissection and cumbersome rod connections.

Purpose of the Study:

  • To describe a novel S1-AI screw fixation technique for sacral and iliac fixation.
  • To evaluate the feasibility and potential benefits of this technique in degenerative spinal conditions requiring pelvic fixation.

Main Methods:

  • The study utilized surgical video, artist's illustrations, and intraoperative photographs.
  • The S1-AI technique allows for single-screw fixation, reducing distal sacral dissection and simplifying rod connection.

Main Results:

  • The S1-AI technique facilitates single-screw sacral and iliac fixation.
  • It requires less distal dissection and offers easier rod connection compared to traditional methods.
  • This technique may be suitable for degenerative conditions needing pelvic fixation.

Conclusions:

  • The S1-AI screw fixation presents a potentially advantageous technique for pelvic fixation.
  • It is a preliminary feasibility study, with limited data on long-term use, especially without L5-S1 anterior lumbar interbody fusion (ALIF).
  • Considered for salvage in short-segment revision fusions with loosened S1 screw fixation.