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Updated: Feb 13, 2026
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Multilevel Oblique Lumbar Interbody Fusion in Degenerative Lumbar Disc Disease with Instability
Published on: July 25, 2025
1.3K
Response rate does not affect patient-reported outcome after lumbar discectomy
P Elkan1,2,3, T Lagerbäck1, H Möller1,4
1Department of Clinical Sciences, Intervention and Technology (CLINTEC), Karolinska Institutet, 141 86, Stockholm, Sweden.
Summary
Quality registers provide valuable patient data, but require careful interpretation. This study found similar outcomes between a national spine registry and a prospective study for lumbar discectomy patients, suggesting registry data is reasonably representative.
Area of Science:
- Spine surgery outcomes research
- Clinical data registry analysis
- Patient-reported outcome measures (PROMs)
Background:
- Quality registers offer insights into large patient populations but may have limitations in data quality and follow-up rates compared to research studies.
- Comparing data from quality registers with prospective studies is crucial for understanding potential biases and representativeness.
- Lumbar discectomy is a common surgical procedure, making its outcome assessment in different data collection settings important.
Purpose of the Study:
- To quantify outcome differences between a national spine quality register (Swespine) and a prospective observational study (LDHS).
- To assess the representativeness of patient-reported outcome data collected through a national quality register.
- To evaluate the impact of different follow-up rates on outcome interpretation in spine surgery research.
Main Methods:
- Adult patients undergoing lumbar discectomy between 2004-2010 were analyzed from Swespine (n=7791) and LDHS (n=177).
- Follow-up rates at 1 and 2 years were significantly higher in the LDHS (98%, 99%) compared to Swespine (73%, 62%).
- Patient-reported outcomes including VAS, ODI, EQ-5D, satisfaction, and global assessment were compared at baseline and 1-2 year follow-ups.
Main Results:
- Baseline patient-reported outcomes showed minor differences between groups, within minimal clinically important differences (MCID).
- Both groups demonstrated significant improvement in outcomes post-surgery, with no substantial differences at 1 or 2 years, all within MCID.
- Complications and reoperations were similar, with the exception of a higher rate of surgical site infections in the LDHS group.
Conclusions:
- National quality registers like Swespine can provide reasonably representative patient-reported outcome data for large cohorts, even with lower response rates.
- Two-year follow-up data did not appear to add significant additional information beyond 1-year outcomes in this comparison.
- The findings support the utility of quality registers in spine surgery research, while acknowledging the need for careful interpretation.
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