Abstract
Purpose
We aimed to identify patient characteristics associated with favourable long-term outcomes after lumbar total disc replacement (TDR).
Methods
We analysed a cohort of 82 patients with degenerative disc and chronic low back pain (LBP) who were treated with TDR and originally participated in a randomised trial comparing TDR and multidisciplinary rehabilitation. Potential predictors were measured at baseline, and the outcomes assessed 8 years after they received allocated treatment. Outcome measures were dichotomised according to whether the participants achieved a clinically important functional improvement (15 points or more on the Oswestry Disability Index, ODI) (primary outcome) and whether they were employed at 8-year follow-up (secondary outcome). Associations between potential predictors and outcomes were modelled using logistic regression. For the secondary outcome, the results were also organised in a prediction matrix and expressed as probabilities.
Results
For 71 patients treated with TDR according to protocol, the follow-up time was 8 years. For a subgroup of 11 patients randomised to rehabilitation who crossed over and received TDR, the median postoperative follow-up time was 72 (range 41–88) months. Of all assessed baseline variables, only presence of Modic changes (type 1 and/or 2) was statistically significantly associated with an improvement of ≥ 15 ODI points. The probability of employment at 8-year follow-up was 1% for patients with ≥ 1 year of sick leave, comorbidity, ODI ≥ 50 and ≤ 9 years of education prior to treatment, and 87% for patients with < 1 year of sick leave, no comorbidity, ODI < 50 and higher education.
Conclusions
Patients with Modic changes prior to the TDR surgery were more likely to report a clinically important functional improvement at long-term follow-up. Comorbidity, low level of education, long-term sick leave and high ODI score at baseline were associated with unemployment at long-term follow-up.
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Acknowledgements
Maren Hjelle Guddal: collecting and punching data. Marianne Bakke Johnsen: collecting and punching data. Eira Kathleen Ebbs: language help.
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None of the authors has any potential conflict of interest.
Funding
The study was funded by Oslo University Hospital, South Eastern Norway Regional Health Authority (Grant no. 2007082) and EXTRA funds from the Norwegian Foundation for Health and Rehabilitation through the Norwegian Back Pain Association ((Grant no. 2012/2/0236). The funders had no role in the study design, data collection, data analysis, data interpretation, or writing of the report.
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Furunes, H., Hellum, C., Brox, J.I. et al. Lumbar total disc replacement: predictors for long-term outcome. Eur Spine J 27, 709–718 (2018). https://doi.org/10.1007/s00586-017-5375-1
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DOI: https://doi.org/10.1007/s00586-017-5375-1