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Defining Substantial Clinical Benefit Following Lumbar Spine Arthrodesis

¹ Kenton D. Leatherman Spine Center, 210 East Gray Street, Suite 900, Louisville, KY 40202. E-mail address for S.D. Glassman: tallgeyer{at}spinemds.com
² The Spinal Research Foundation, 1831 Wiehle Avenue, Reston, VA 20190
³ Department of Orthopaedic Surgery, University of California at San Francisco, Box 0728, 500 Parnassus Avenue, MU 320, San Francisco, CA 94143-0728
⁴ Department of Orthopaedic Surgery, University of Minnesota, 2450 Riverside Avenue South, R 200, Minneapolis, MN 55454

Investigation performed at the Kenton D. Leatherman Spine Center, Louisville, Kentucky

Disclosure: In support of their research for or preparation of this work, one or more of the authors received, in any one year, outside funding or grants of less than $10,000 from Medtronic Sofamor Danek. In addition, one or more of the authors or a member of his or her immediate family received, in any one year, payments or other benefits in excess of $10,000 or a commitment or agreement to provide such benefits from a commercial entity (Medtronic Sofamor Danek). Also, a commercial entity (Medtronic Sofamor Danek) paid or directed in any one year, or agreed to pay or direct, benefits in excess of $10,000 to a research fund, foundation, division, center, clinical practice, or other charitable or nonprofit organization with which one or more of the authors, or a member of his or her immediate family, is affiliated or associated.

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Methods: Prospectively collected preoperative and one-year postoperative health-related quality-of-life measures from 357 patients who were managed with lumbar spine arthrodesis for the treatment of degenerative conditions were identified. Candidate substantial clinical benefit thresholds for the Short Form-36 physical component score, Oswestry Disability Index, and back and leg pain numeric rating scales were identified with use of receiver operating characteristic curve analysis. Receiver operating characteristic curves were used to discriminate between patients who reported being "much better" or "about the same" with use of the validated Short Form-36 health transition item and between those who reported being "mostly satisfied" or "unsure" with use of a nonvalidated but more surgery-specific satisfaction-with-results survey. For each health-related quality-of-life measure, three response parameters were used: net change, percent change, and raw score at the time of the one-year follow-up.

Results: Substantial clinical benefit thresholds for the Short Form-36 physical component score were a 6.2-point net improvement, a 19.4% improvement, or a final raw score of 35.1 points. Substantial clinical benefit thresholds for the Oswestry Disability Index were an 18.8-point net improvement, a 36.8% improvement, or a final raw score of <31.3 points. Substantial clinical benefit thresholds for the back pain and leg pain numeric rating scales were a 2.5-point net improvement or a final raw score of <3.5 points. Substantial clinical benefit thresholds for percent change were 41.4% for the back pain numeric rating scale and 38.8% for the leg pain numeric rating scale.

Conclusions: We believe that thresholds of substantial clinical benefit for commonly used health-related quality-of-life measures following lumbar spine arthrodesis are important as they describe a magnitude of change that the patient recognizes as a major improvement.

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