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Outcomes of Surgical Decompression in Patients With Very Severe Degenerative Cervical Myelopathy

Kopjar, Branko, MD, PhD, FACE; Bohm, Parker E., MD; Arnold, Joshua H., BA, MBS; Fehlings, Michael G., MD, PhD, FRCSC§; Tetreault, Lindsay A., PhD; Arnold, Paul M., MD

doi: 10.1097/BRS.0000000000002602
CERVICAL SPINE

Study Design. A prospective observational international study.

Objective. The aim of this study was to evaluate outcomes of decompressive surgery in patients with very severe degenerative cervical myelopathy (DCM).

Summary of Background Data. Although decompressive surgery has been evidenced as a safe and effective approach for patients with myelopathic deficiencies, studies have suggested residual disability following treatment in patients with more severe disease presentation.

Methods. Postoperative outcomes of 60 patients with very severe DCM (modified Japanese Orthopaedic Association [mJOA] score ≤8) were compared to outcomes of 188 patients with severe DCM (mJOA 9–11). Postimputation follow-up rate was 93.1%. Unadjusted and adjusted analyses were performed using two-way repeated measures of covariance.

Results. The two cohorts were similar in demographics, length of duration of myelopathy symptoms, source of stenosis, and surgical approaches used to decompress the spine. The very severe and severe cohorts differed in preoperative Nurick grades (4.97 vs. 3.91, respectively, P < 0.0001) and Neck Disability Index scores (45.20 vs. 56.21, respectively, P = 0.0006). There were no differences in Short Form 36 (SF-36v2) physical (PCS) and mental (MCS) component summary scores. Both cohorts improved in mJOA, Nurick, Neck Disability Index, and SF-36v2 PCS and MCS scores. Despite the substantial postoperative improvements, patients in both cohorts had considerable residual symptoms. Two-thirds of the patients in the very severe cohort had severe (mJOA ≤11) or moderate (mJOA ≤ 14) myelopathy symptoms at 24 months follow-up. Longer duration of disease was associated with poorer treatment response.

Conclusion. Decompressive surgery is effective in patients with very severe DCM; however, patients have significant residual symptoms and disability. The very severe subgroup (mJOA ≤8) of patients with DCM represents a distinct group of patients and their different clinical trajectory is important for clinicians and patients to recognize. Duration of symptoms negatively affects chances for recovery. Whenever possible, patients with DCM should be treated before developing very severe symptomatology.

Level of Evidence: 2

Department of Health Services, University of Washington, Seattle, WA

Department of Neurosurgery, University of Kansas Medical Center, Kansas City, KS

Tufts University School of Medicine Public Health and Professional Degree Programs, Boston, MA

§Department of Surgery; University of Toronto, Toronto, Ontario, Canada

University College Cork, Graduate Entry Medicine, Cork, Ireland.

Address correspondence and reprint requests to Branko Kopjar, MD, PhD, FACE, Department of Health Services, University of Washington, H690C, Health Sciences Bldg, P.O. Box 357660, Seattle, WA 98195-7660; E-mail: brankok@uw.edu

Received 14 August, 2017

Revised 6 December, 2017

Accepted 26 December, 2017

The manuscript submitted does not contain information about medical device(s)/drug(s).

A Clinical and Translational Science Award (CTSA) grant from the National Center for Advancing Translational Sciences (NCATS) awarded for Frontiers: The Heartland Institute for Clinical and Translational Research TL1TR000120, AOSpine International, and AOSpine North America funds were received in support of this work.

Relevant financial activities outside the submitted work: consultancy, grants, stocks, patents, royalties, travel/accommodations/meeting expenses.

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