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Postoperative Dural Sac Cross-sectional Area as an Association for Outcome after Surgery for Lumbar Spinal Stenosis. Clinical and Radiological Results from the Nordsten-spinal Stenosis Trial Research Article

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Published article

CONCLUSION: Less aggressive decompression performed similarly to wider decompression across multiple different patient-reported outcome measures at 2 years following surgery.
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Spine (Phila Pa 1976). 2023 Feb 20. doi: 10.1097/BRS.0000000000004565. Online ahead of print.

ABSTRACT

STUDY DESIGN: Prospective cohort study.

OBJECTIVE: To investigate the association between postoperative Dural Sac Cross-sectional Area (DSCA) after decompressive surgery for Lumbar Spinal Stenosis (LSS), and clinical outcome. Furthermore, to investigate if there is a minimum threshold for how extensive a posterior decompression needs to be to achieve a satisfactory clinical result.

SUMMARY OF BACKGROUND DATA: There is limited scientific evidence for how extensive a lumbar decompression needs to be to obtain a good clinical outcome in patients with symptomatic LSS.

METHODS: All patients were included from the Spinal Stenosis Trial (SST) of the NORwegian Degenerative spondylolisthesis and spinal STENosis (NORDSTEN)-study. The patients underwent decompression according to 3 different methods. DSCA measured on lumbar MRI at baseline and at three months follow up, and patient reported outcome at baseline and at two-year follow up were registered in a total of 393 patients. Mean age was 68 (SD 8.3), proportion of males were 204/393 (52%), proportion of smokers were 80/393 (20%), and mean BMI was 27.8 (SD 4.2).The cohort was divided into quintiles based on the achieved DSCA postoperatively, numeric, and relative increase of DSCA, and the association between the increase in DSCA and clinical outcome were evaluated.

RESULTS: At baseline, the mean DSCA in the whole cohort was 51.1 mm2 (SD 21.1). Postoperatively the area increased to a mean area of 120.6 mm2 (SD 46.9). The change in ODI in the quintile with the largest DSCA was -22.0 (95% CI: -25.6 – -18), and in the quintile with the lowest DSCA the ODI change was -18.9 (95% CI: -22.4 – -15.3). There were only minor differences in clinical improvement for patients in the different DSCA quintiles.

CONCLUSION: Less aggressive decompression performed similarly to wider decompression across multiple different patient-reported outcome measures at 2 years following surgery.

PMID:36809364 | DOI:10.1097/BRS.0000000000004565

The London Spine Unit : most specialised spinal hospital in London

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Postoperative Dural Sac Cross-sectional Area as an Association for Outcome after Surgery for Lumbar Spinal Stenosis. Clinical and Radiological Results from the Nordsten-spinal Stenosis Trial

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Spine (Phila Pa 1976). 2023 Feb 20. doi: 10.1097/BRS.0000000000004565. Online ahead of print.ABSTRACTSTUDY DESIGN: Prospective cohort study.OBJECTIVE: To investigate the association between postoperative Dural Sac Cross-sectional Area (DSCA) after decompressive surgery for Lumbar Spinal Stenosis (LSS), and clinical outcome. Furthermore, to investigate if there is a minimum threshold for how extensive a posterior decompression needs…

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