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- Title
Predicting Mechanical Failure Following Cervical Deformity Surgery: A Composite Score Integrating Age-Adjusted Cervical Alignment Targets.
- Authors
Lafage, Renaud; Smith, Justin S; Soroceanu, Alexandra; Ames, Christopher; Passias, Peter; Shaffrey, Christopher; Mundis, Gregory; Alshabab, Basel Sheikh; Protopsaltis, Themistocles; Klineberg, Eric; Elysee, Jonathan; Kim, Han Jo; Bess, Shay; Schwab, Frank; Lafage, Virginie
- Abstract
Study Design: Retrospective cohort study. Objectives: Investigate a composite score to evaluate the relationship between alignment proportionality and risk of distal junctional kyphosis (DJK). Methods: 84 patients with minimum 1 year follow-up were included (age = 61.1 ± 10.3 years, 64.3% women). The Cervical Score was constructed using offsets from age-adjusted normative values for sagittal vertical axis (SVA), T1 Slope (TS), and TS minus cervical lordosis (CL). Individual points were assigned based on offset with age-adjusted alignment targets and summed to generate the Cervical Score. Rates of mechanical failure (DJK revision or severe DJK [DJK> 20° and ΔDJK> 10°]) were assessed overall and based on Cervical Score. Logistical regressions assessed associations between early radiographic alignment and 1-year failure rate. Results: Mechanical failure rate was 21.4% (N = 18), 10.7% requiring revision. By multivariate logistical regression: 3-month T1S (OR:.935), TS-CL (OR:0.882), and SVA (OR:1.015) were independent predictors of 1-year failure (all P <.05). Cervical Score ranged (−6 to 6), 37.8% of patients between −1 and 1, and 50.0% with 2 or higher. DJK patients had significantly higher Cervical Score (4.1 ± 1.3 vs.6 ± 2.2, P <.001). Patients with a score ≥3 were significantly more likely to develop a failure (71.4%) with OR of 38.55 (95%CI [7.73; 192.26]) and Nagelkerke r2.524 (P <.001) Conclusion: This study developed a composite alignment score predictive of mechanical failures in CD surgery. A score ≥3 at 3 months following surgery was associated with a marked increase in failure rate. The Cervical Score can be used to analyze sagittal alignment and help define realignment objectives to reduce mechanical failure.
- Subjects
MECHANICAL failures; HUMAN abnormalities; SURGERY; KYPHOSIS; EXPERIMENTAL design
- Publication
Global Spine Journal, 2023, Vol 13, Issue 8, p2432
- ISSN
2192-5682
- Publication type
Article
- DOI
10.1177/21925682221086535