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Related Experiment Videos

Anatomic considerations for dorsal sacral plate-screw fixation

R Xu1, N A Ebraheim, A Mohamed

  • 1Department of Orthopaedic Surgery, Medical College of Ohio, Toledo 43699, USA.

Journal of Spinal Disorders
|October 1, 1995
PubMed
Summary
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This study on lumbosacral fixation found that extending plates to the S2 region, with partial ilium removal, increases fixation space. This technique may improve stability in cases of osteoporosis or vertebral metastases.

Area of Science:

  • Orthopedic surgery
  • Spinal anatomy
  • Biomechanical fixation

Background:

  • Current lumbosacral fixation techniques primarily focus on the S1 region.
  • Limited data exists on the feasibility and anatomical feasibility of extending fixation beyond S1.
  • Osteoporosis and vertebral metastases can compromise fixation at the S1 level.

Purpose of the Study:

  • To assess the feasibility of lumbosacral plate fixation extending beyond the S1 region.
  • To quantitatively evaluate the posterior sacroiliac region for enhanced plate fixation.
  • To measure the dimensions of the S1 and S2 pedicle and lateral mass.

Main Methods:

  • Utilized five cadaveric pelves and 40 dry bony specimens.
  • Performed partial removal of the posterior ilium to measure available surface area for dorsal sacral plate fixation.

Related Experiment Videos

  • Measured distances between S1/S2 dorsal foramina and the medial posterior ilium before and after ilium removal.
  • Assessed S1 and S2 pedicle and lateral mass depths.

    • Main Results:

    • Partial posterior ilium removal significantly increased the available space for plate fixation at both S1 (11.3mm to 16.6mm) and S2 (8.4mm to 13mm) levels.
    • Average S1 pedicle depth was 37.1mm and lateral mass depth was 37.3mm.
    • Average S2 pedicle depth was 32.2mm and lateral mass depth was 33.9mm.
    • The technique enhances posterior sacral space without severe compromise to the sacroiliac joint.

    Conclusions:

    • Lumbosacral plate fixation can be extended to the S2 region.
    • Partial posterior ilium removal is a feasible technique to increase fixation area.
    • This approach offers potential benefits for patients with compromised S1 fixation due to osteoporosis or metastases.