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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
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.
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.
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.