Evidence map›Paper›PMID 34129060›Full record

ArticleOsteoporosis international : a journal established as result of cooperation between the European Foundation for Osteoporosis and the National Osteoporosis Foundation of the USA2021

Excess mortality after hip fracture: fracture or pre-fall comorbidity?

M H L Liow, G Ganesan, J D Y Chen, J S B Koh, T S Howe, E-L Yong, M S Kramer, K B Tan

Abstract read
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In one paragraph

Article in Osteoporosis international : a journal established as result of cooperation between the European Foundation for Osteoporosis and the National Osteoporosis Foundation of the USA, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 21 papers.

0numbers the graph read from it
0cells of the map it votes in
21citing papers in PubMed
2.9field-weighted citation impact, top 9% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

21 citing papers in PubMed, 29 citations in OpenAlex.

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  7. Optimizing Surgical Strategies for Elderly Patients With Femoral Neck Fracture: The Critical Role of Comorbidities.Journal of the American Academy of Orthopaedic Surgeons. Global research & reviews · 2025
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  9. How accurately do finite element models predict the fall impact response of ex vivo specimens augmented by prophylactic intramedullary nailing?Journal of orthopaedic research : official publication of the Orthopaedic Research Society · 2025
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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

8 authors at 4 institutions in 2 countries.

M H L LiowDepartment of Orthopaedic Surgery, Singapore General Hospital, Singapore, Singapore. Lincoln.liow.m.h@singhealth.com.sg.
G GanesanDivision of Policy, Research and Evaluation, Ministry of Health, Singapore, Singapore.ORCID http://orcid.org/0000-0002-9601-5404
J D Y ChenDepartment of Orthopaedic Surgery, Singapore General Hospital, Singapore, Singapore.
J S B KohDepartment of Orthopaedic Surgery, Singapore General Hospital, Singapore, Singapore.
T S HoweDepartment of Orthopaedic Surgery, Singapore General Hospital, Singapore, Singapore.
E-L YongDepartment of Obstetrics and Gynecology, National University Hospital, National University of Singapore, Singapore, Singapore.
M S KramerDepartment of Obstetrics and Gynecology, National University Hospital, National University of Singapore, Singapore, Singapore.
K B TanDivision of Policy, Research and Evaluation, Ministry of Health, Singapore, Singapore.
Singapore General Hospital · SGMinistry of Health · SGNational University of Singapore · SGSingHealth · SG

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Comorbidity and hip fracture independently increased mortality risk for 9 years in both sexes, with a significant additive interaction in the first year among women and through 6 years among men.

introductionHip fracture is associated with a persistently elevated mortality risk, but it is unknown whether the elevated risk is due to the fracture or to pre-fracture comorbidity.

methodsIn a population-based study in Singapore with 9 years of follow-up, patients age > 50 with first hip fracture from 2008 to 2017 were pair-matched to a cohort without hip fracture by age, sex, ethnicity, and pre-fracture Charlson Comorbidity Index (CCI). We investigated additive interaction using the relative excess risk due to interaction (RERI) and multiplicative interaction using the ratio of relative risks.

resultsTwenty-two thousand five hundred ninety of 22,826 patients with a first hip fracture in 2008-2017 were successfully matched. Hip fracture and comorbidity independently increased mortality risk for 9 years in both sexes. After adjustment for comorbidity, excess mortality risk continued to persist for 9 years post-fracture in both men and women. Women with a hip fracture and pre-fracture CCI > 4 had a higher relative risk (RR) of mortality at 9 years of 3.29 [95% confidence interval (CI) 3.01, 3.59] than those without comorbidity (RR 1.51, 95%CI 1.36, 1.68) compared to the referent without hip fracture or comorbidity. An additive interaction between hip fracture and pre-fracture CCI > 4 was observed in the first post-fracture year` [relative excess risk due to interaction (RERI) 1.99, 95%CI 0.97, 3.01]. For men with CCI ≥ 4, the positive additive interaction was observed through 6 years.

conclusionsExcess mortality risks post-fracture are attributable to both the fracture and pre-fracture comorbidity. Early interventions in hip fracture patients with high comorbidity could reduce their excess mortality.

Indexed as

Hip FracturesCohort StudiesComorbidityFemaleHumansMaleRisk FactorsSingaporeHip fractureInteraction effectMatched cohort studyMortality

Identifiers

PMID34129060
OpenAlexW3167689126

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Registered trials

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.