Postoperative mortality in the COVID-positive hip fracture patient, a systematic review and meta-analysis

PURPOSE: The extent to which concomitant COVID-19 infection increases short-term mortality following hip fracture is not fully understood. A systemic review and meta-analysis of COVID-19 positive hip fracture patients (CPHFPs) undergoing surgery was conducted to explore the association of COVID-19 with short-term mortality. METHODS: Review of the literature identified reports of short-term 30-day postoperative mortality in CPHFPs. For studies including a contemporary control group of COVID-19 negative patients, odds ratios of the association between COVID-19 infection and short-term mortality were calculated. Short-term mortality and the association between COVID-19 infection and short-term mortality were meta-analyzed and stratified by hospital screening type using random effects models. RESULTS: Seventeen reports were identified. The short-term mortality in CPHFPs was 34% (95% C.I., 30–39%). Short-term mortality differed slightly across studies that screened all patients, 30% (95% C.I., 22–39%), compared to studies that conditionally screened patients, 36% (95% C.I., 31–42%), (P = 0.22). The association between COVID-19 infection and short-term mortality produced an odds ratio of 7.16 (95% C.I., 4.99–10.27), and this was lower for studies that screened all patients, 4.08 (95% C.I., 2.31–7.22), compared to studies that conditionally screened patients, 8.32 (95% C.I., 5.68–12.18), (P = 0.04). CONCLUSION: CPHFPs have a short-term mortality rate of 34%. The odds ratio of short-term mortality was significantly higher in studies that screened patients conditionally than in studies that screened all hip fracture patients. This suggests mortality prognostication should consider how COVID-19 infection was identified as asymptomatic patients may fare slightly better. SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1007/s00590-022-03228-9.