Medium-term mortality after hip fractures and COVID-19: A prospective multi-centre UK study

Postoperative pneumonia after femoral fracture surgery: an in-depth retrospective analysis

BACKGROUND

Femoral fractures significantly contribute to disability, predominantly in the elderly. Despite this, data on postoperative pneumonia following femoral fracture surgeries remains sparse. Our study sought to explore the incidence and impact of postoperative pneumonia on outcomes following such surgeries.

METHODS

A retrospective study analyzed femoral fracture patients hospitalized from 2016 to 2022. We scrutinized postoperative outcomes, including pneumonia, hospital stay duration, intensive care unit (ICU) admissions, and in-hospital mortality. We established stringent diagnostic criteria for postoperative pneumonia, incorporating both clinical signs and radiological evidence, excluding patients with prior infections or those discharged within 24 h post-surgery. Statistical analyses involved Chi-square and t-tests, linear regression, and logestic regression using SPSS.

RESULTS

Out of 636 patients, 10.8% were diagnosed with postoperative pneumonia. The average age was 79.55 ± 8.57 years, with a male prevalence of 47.8%. Common comorbidities were hypertension (78.3%), diabetes (60.9%), and cardiovascular diseases (40.6%). Surgical interventions were categorized as intramedullary nailing (40.6%), partial hip replacement (37.7%), and dynamic hip screw (21.7%). Postoperative pneumonia was associated with older age (AOR = 1.053, 95% CI 1.020 to 1.087, p = 0.002), ICU admission (AOR = 2.283, 95% CI 1.256 to 4.148, p = 0.007), and longer length of hospital stay (AOR = 1.079, 95% CI 1.030 to 1.130, p = 0.001). The presence of pneumonia was associated with a 2.621-day increase in hospitalization after adjusting for other variables (p < 0.001, 95% CI: 1.454 to 3.789).

CONCLUSION

This study accentuates the clinical significance of postoperative pneumonia in femoral fracture patients, with a noted incidence of 10.8%. A notable association with older age, prolonged hospital stays, and ICU admissions was observed, underscoring the necessity of addressing this complication to improve patient outcomes and healthcare resource allocation.

Study on the poly(methyl methacrylate-acrylic acid)/calcium phosphate cement composite bound by chelation with enhanced water absorption and biomechanical properties

Polymethylmethacrylate (PMMA) bone cement has been widely used as a critical material for fixing prostheses and filling bone defects. The shrinkage of PMMA bone cement was addressed by the additives, however, the uneven integral water absorption and expansion performance as well as the deteriorated mechanical properties of the modified bone cement after immersion in phosphate buffered saline (PBS) and simulation body fluid (SBF) affected the long-term stability after implantation. Calcium phosphate cement (CPC) is a biomaterial with promising applications in orthopedics, whose hydration reaction provides an important driving force for the transfer of water. Besides, the mechanical properties of CPC can be enhanced with the curing process. In this study, CPC was utilized to modify the poly(methyl methacrylate-acrylic acid) [P(MMA-AA)] bone cement. The results demonstrated the successful construction of interconnected CPC water delivery networks in the P(MMA-AA)/CPC composite, the water absorption ratio and expansion ratio of the composite were up to 131.18 ± 9.14% and 168.19 ± 5.44%, respectively. Meanwhile, the transformation of CPC water delivery networks into rigid mechanical support networks as well as the chelation interaction between organic-inorganic enhanced the mechanical properties of the composite after immersion, the compressive strength after immersion reached 62.97 ± 0.97 MPa, which was 27.65% higher than that before immersion. The degradation ratio of the composite was up to 13.76 ± 0.23% after 9 days of immersion, which was 16.4% higher than that of CPC. Furthermore, composites exhibited superior biocompatibility as the release of Ca2+. Therefore, P(MMA-AA)/CPC composite serves as a promising medical filling material for clinical use.

The Impact of COVID-19 on the Prevalence, Mortality, and Associated Risk Factors for Mortality in Patients with Hip Fractures: A Meta-Analysis

OBJECTIVE

This study aimed to assess (1) the prevalence of COVID-19 in patients with hip fracture; (2) the mortality rate of patients with hip fracture associated with COVID-19; (3) risk factors associated with mortality in patients with hip fracture; and (4) the effects of COVID-19 on surgical outcomes of patients with hip fracture.

DESIGN

Meta-analysis.

SETTING AND PARTICIPANTS

Patients with hip fractures during COVID-19.

METHODS

PubMed, Web of Science, and Embase were systematically reviewed. The outcomes included the prevalence of COVID-19, case fatality rate, 30-day mortality, cause of death, risk factors associated with the mortality of patients with hip fracture, time to surgery, surgical time, and length of hospitalization. Risk ratio or weight mean difference with 95% confidence intervals were used to pool the estimates.

RESULTS

A total of 60 studies were included in this meta-analysis. The pooled estimate showed that the prevalence of COVID-19 was 21% in patents with hip fractures. Patients with hip fracture with COVID-19 had an increased 30-day mortality risk compared with those without the infection. The main causes of death were respiratory failure, COVID-19-associated pneumonia, multiorgan failure, and non-COVID-19 pneumonia. The hospitalization was longer in patients with COVID-19 when compared with those without the infection, but was shorter in patients during the pandemic period. The surgery time and time to surgery were not significantly different between patients during or before the pandemic period and in those with or without COVID-19.

CONCLUSIONS AND IMPLICATIONS

The 30-day mortality rate was significantly higher in patients with hip fracture with COVID-19 infection than those without. Patients with COVID-19 had a higher all-cause mortality rate than those without. This information can be used by the medical community to guide the management of patients with hip fracture with COVID-19.

Comparing the 30-Day Mortality for Hip Fractures in Patients with and without COVID-19: An Updated Meta-Analysis

We conducted an updated meta-analysis to evaluate the 30-day mortality of hip fractures during the COVID-19 pandemic and assess mortality rates by country. We systematically searched Medline, EMBASE, and the Cochrane Library up to November 2022 for studies on the 30-day mortality of hip fractures during the pandemic. Two reviewers used the Newcastle-Ottawa tool to independently assess the methodological quality of the included studies. We conducted a meta-analysis and systematic review including 40 eligible studies with 17,753 patients with hip fractures, including 2280 patients with COVID-19 (12.8%). The overall 30-day mortality rate for hip fractures during the pandemic was 12.6% from published studies. The 30-day mortality of patients with hip fractures who had COVID-19 was significantly higher than those without COVID-19 (OR, 7.10; 95% CI, 5.51-9.15; I2 = 57%). The hip fracture mortality rate increased during the pandemic and varied by country, with the highest rates found in Europe, particularly the United Kingdom (UK) and Spain. COVID-19 may have contributed to the increased 30-day mortality rate in hip fracture patients. The mortality rate of hip fracture in patients without COVID-19 did not change during the pandemic.

Mortality and outcome in fragility hip fracture care during COVID-19 pandemic in Police General Hospital, Thailand

Objectives

The objective of this study is to assess outcomes and patient's mortality of Police General Hospital's fracture liaison service (PGH's FLS) during Coronavirus disease 2019 (COVID-19) outbreak comparing to the former period.

Methods

Retrospective cohort study was performed in patients aged 50 or older who were admitted with fragility hip fracture in Police General Hospital, Bangkok, between January 1, 2018 to December 31, 2019 (before pandemic) comparing to January 1, 2020 to December 31, 2021 (pandemic) using the electronic database. The outcomes were mortality and other outcomes in one-year follow up.

Results

A total of 139 fragility hip fractures were recorded in 2018–2019 (before pandemic) compared with 125 in 2020–2021 (pandemic). The 30-day mortality in hip fracture numerically increased from 0% to 2.4% during the pandemic. One-year mortality was significantly escalated from 2 cases (1.4%) to 5 cases (4%) (P = 0.033). However, the cause of mortality was not related with COVID-19 infection. We also found a significantly shorter time to surgery but longer wait time for bone mineral density (BMD) testing and initiation of osteoporosis medication in pandemic period.

Conclusions

The results of this study in COVID-19 pandemic period, 1-year mortality rate was significantly higher but they were not related with COVID-19 infection. We also found longer time to initial BMD testing and anti-osteoporotic medication and more loss of follow up, causing lower anti-osteoporotic medication taking. In contrast, the time to surgery became shorter during the pandemic.

The Impact of the COVID-19 Pandemic on the Neck of the Femur and Hip Fracture Surgery Volumes in the Lazio Region

This study compares surgery volumes for fractures of the neck of the femur (FNF) and hip replacements during the COVID-19 pandemic compared with previous years. Historical (2018–2019) and pandemic (2020–2021) surgery rates for FNF and hip replacement in Lazio, adjusted for age and gender, were calculated per period and compared with a Poisson regression model. For hip replacement surgery, a comparison of different types of hospitals was also made. Before COVID-19’s spread, no difference was found in the volume of surgery of both interventions. From the lockdown to the end of 2021, a decrease in surgery volumes for FNF with stabilization between summer 2020 and summer 2021, as well as an additional decline beginning at the start of Omicron’s spread, were found. Hip replacement surgeries showed a greater decline during the lockdown period and increased during summer 2020 and during the Delta wave period. The increment in hip replacements, mainly observed in 2021, is due to private and religious hospitals. These results highlight that the pandemic emergency, caused by SARS-CoV-2, has had an important indirect effect on the population’s health assistance in the field of orthopedics.