The clinical value of early postoperative MRI after lumbar spine surgery.
BACKGROUND
MRI scanning has historically been considered difficult to interpret in the early period following lumbar spine surgery, and hence of limited value. We investigate the hypothesis that MRI scanning within 6 weeks of lumbar spine surgery cannot accurately diagnose neural compression in symptomatic patients, and define the utility of postoperative MRI in this context.


METHODS
A series of 32 consecutive patients had early postoperative MRI following lumbar discectomy or laminectomy for continued, worsening or new symptoms of neural compression. The neuroradiologists' reports were evaluated for the reported presence of neural compression and confidence level (low, medium, high). These MRI findings were then compared to the patients' subsequent course and findings of any surgery performed.


RESULTS
Twenty of 29 scans (69%) were confidently predictive of the correct treatment pathway (reoperation with positive finding or conservative treatment with a good outcome) whereas 3/3 (100%) patients who had conservative management despite the MRI confidently suggesting compression had poor outcome. The MRI is highly likely to influence management: 11/14 (79%) patients with scans suggesting neural compression had revision surgery and 18/18 (100%) patients with no neural compression on MRI were managed conservatively.


CONCLUSIONS
Our data suggest that early MRI scanning after lumbar laminectomy or discectomy accurately detects neural compression at the surgery site in patients with continued or worsening symptoms.
Academic Neurosurgery Unit, St George's University of London, London, UK. mjncrocker@gmail.com
Matthew
M
Crocker
Timothy L
TL
Jones
Philip
P
Rich
B Anthony
BA
Bell
Marios C
MC
Papadopoulos
D000328:Adult; D000368:Aged; D019299:Decompression, Surgical; D017586:Diskectomy; D006801:Humans; D008159:Lumbar Vertebrae / Q000601:surgery*; D008279:Magnetic Resonance Imaging / Q000379:methods; D008875:Middle Aged; D009408:Nerve Compression Syndromes / Q000175:diagnosis* / Q000601:surgery; D011182:Postoperative Care; D011183:Postoperative Complications / Q000175:diagnosis* / Q000601:surgery; D012086:Reoperation; D013997:Time Factors; D016896:Treatment Outcome