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Related Experiment Videos

Pseudarthrosis: US evaluation after posterolateral spinal fusion: work in progress

J A Jacobson1, M Starok, M N Pathria

  • 1Department of Radiology, University of California, San Diego Medical Center, USA.

Radiology
|September 1, 1997
PubMed
Summary

Ultrasound (US) effectively detects pseudarthrosis after spinal fusion, showing 100% sensitivity for identifying non-fusion sites. This imaging technique is valuable for evaluating bone graft healing, particularly with spinal hardware present.

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Area of Science:

  • Orthopedic Surgery
  • Radiology
  • Spinal Fusion Imaging

Background:

  • Pseudarthrosis is a common complication following spinal fusion surgery.
  • Accurate assessment of fusion is crucial for patient outcomes and surgical planning.

Purpose of the Study:

  • To evaluate the diagnostic value of ultrasound (US) in identifying pseudarthrosis after posterolateral spinal fusion.
  • To compare US findings with surgical outcomes in patients undergoing second-look surgery.

Main Methods:

  • Ultrasound examination was performed on 10 patients prior to second-look surgery for posterolateral spinal fusion.
  • 20 sites per patient were assessed for bone graft incorporation, fusion status, and hardware presence.
  • US findings were correlated with intraoperative surgical findings.

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Main Results:

  • Ultrasound correctly identified all 10 sites of pseudarthrosis observed during surgery (100% sensitivity).
  • Ultrasound depicted solid fusion in 6 out of 10 surgically confirmed fusion sites (60% specificity).
  • Fusion was occasionally obscured or mistaken for hardware, impacting accuracy (80%).

Conclusions:

  • Ultrasound is a valuable tool for detecting posterolateral bone graft pseudarthrosis.
  • Its utility is particularly noted in the presence of spinal instrumentation, despite potential hardware interference.