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A prospective randomised study on the long-term effect of lumbar fusion on adjacent disc degeneration

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Abstract

The existence and importance of an accelerated adjacent segment disc degeneration (ASD) after lumbar fusion have previously not been demonstrated by RCTs. The objectives of this study were, to determine whether lumbar fusion in the long term accelerates degenerative changes in the adjacent disc and whether this affects the outcome, by using a prospective randomised design. A total of 111 patients, aged 18–55, with isthmic spondylolisthesis were randomised to exercise (EX, n = 34) or posterolateral fusion (PLF, n = 77), with (n = 37) or without pedicle screw instrumentation (n = 40). The minimum 10 years FU rate was 72%, with a mean FU time of 12.6 years (range 10–17 years). Three radiographic methods of ASD quantification were used, i.e. two digital radiographic measurement methods and the semi quantitative UCLA grading scale. One digital measurement method showed a mean disc height reduction by 2% in the EX group and by 15% in the PLF group (p = 0.0016), and the other showed 0.5 mm more disc height reduction in the PLF compared to the Ex group (ns). The UCLA grading scale showed normal discs in 100% of patients in the EX group, compared to 62% in the PLF group (p = 0.026). There were no significant differences between instrumented and non-instrumented patients. In patients with laminectomy we found a significantly higher incidence of ASD compared to non laminectomised patients (22/47 vs. 2/16 respectively, p = 0.015). In the longitudinal analysis, the posterior and anterior disc heights were significantly reduced in the PLF group, whereas in the EX group only the posterior disc height was significantly reduced. Except for global outcome, which was significantly better for patients without ASD, the clinical outcome was not statistically different in patients with and without ASD. In conclusion, the long-term RCT shows that fusion accelerates degenerative changes at the adjacent level compared with natural history. The study suggests that not only fusion, but also laminectomy may be of pathogenetic importance. The clinical importance of ASD seems limited, with only the more severe forms affecting the outcome.

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Authors and Affiliations

  1. Division of Orthopedics, Department of Clinical Science, Intervention and Technology (CLINTEC), Karolinska University Hospital Huddinge, Karolinska Institutet, 141 86, Stockholm, Sweden

    Per Ekman, Hans Möller & Yiang Xiao Yu

  2. Division of Radiology, Department of Clinical Science, Intervention and Technology (CLINTEC), Karolinska University Hospital Huddinge, Karolinska Institutet, 141 86, Stockholm, Sweden

    Adel Shalabi

  3. Department of Orthopedics, Institution for Clinical Sciences, Sahlgrenska University Hospital, Gothenburg University, 413 45, Gothenburg, Sweden

    Rune Hedlund

  4. Department of Orthopedics, Stockholm Söder Hospital, 118 83, Stockholm, Sweden

    Per Ekman

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  1. Per Ekman
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Ekman, P., Möller, H., Shalabi, A. et al. A prospective randomised study on the long-term effect of lumbar fusion on adjacent disc degeneration. Eur Spine J 18, 1175–1186 (2009). https://doi.org/10.1007/s00586-009-0947-3

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