Correlation between neutrophil-to-lymphocyte ratio and postoperative mortality in elderly patients with hip fracture: a meta-analysis

Yu-Hang Chen, Ching-Hsin Chou, Hsin-Hsien Su, Yu-Ting Tsai, Ming-Hsiu Chiang, Yi-Jie Kuo, Yu-Pin Chen, Yu-Hang Chen, Ching-Hsin Chou, Hsin-Hsien Su, Yu-Ting Tsai, Ming-Hsiu Chiang, Yi-Jie Kuo, Yu-Pin Chen

Abstract

Introduction: The neutrophil-to-lymphocyte ratio (NLR) is a crucial prognosis predictor following several major operations. However, the association between NLR and the outcome after hip fracture surgery is unclear. In this meta-analysis, we investigated the correlation between NLR and postoperative mortality in geriatric patients following hip surgery.

Method: PubMed, Embase, Cochrane library, and Google Scholar were searched for studies up to June 2021 reporting the correlation between NLR and postoperative mortality in elderly patients undergoing surgery for hip fracture. Data from studies reporting the mean of NLR and its 95% confidence interval (CI) were pooled. Both long-term (≥ 1 year) and short-term (≤ 30 days) mortality rates were included for analysis.

Result: Eight retrospective studies comprising a total of 1563 patients were included. Both preoperative and postoperative NLRs (mean difference [MD]: 2.75, 95% CI: 0.23-5.27; P = 0.03 and MD: 2.36, 95% CI: 0.51-4.21; P = 0.01, respectively) were significantly higher in the long-term mortality group than in the long-term survival group. However, no significant differences in NLR were noted between the short-term mortality and survival groups (MD: - 1.02, 95% CI: - 3.98 to 1.93; P = 0.5).

Conclusion: Higher preoperative and postoperative NLRs were correlated with a higher risk of long-term mortality following surgery for hip fracture in the geriatric population, suggesting the prognostic value of NLR for long-term survival. Further studies with well-controlled confounders are warranted to clarify the predictive value of NLR in clinical practice in geriatric patients with hip fracture.

Keywords: Hip fracture; Mortality; Neutrophil-to-lymphocyte ratio.

Conflict of interest statement

The authors declare that they have no competing interests.

© 2021. The Author(s).

Figures

Fig. 1
Fig. 1
Flow diagram of study selection according to PRISMA guidelines
Fig. 2
Fig. 2
Forest plot of the mean difference in preoperative NLR between the mortality and the survival groups with a follow-up duration of > 1 year
Fig. 3
Fig. 3
Forest plot of the mean difference in postoperative NLR between the mortality and survival groups with a follow-up duration of > 1 year
Fig. 4
Fig. 4
Forest plot of the mean difference in preoperative NLR between the mortality and survival groups with a follow-up duration of > 30 days

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