To identify early-occurring healthcare and sociodemographic risk factors associated with lower extremity amputation (LEA) by analysing health trajectories up to 10 years before amputation.

A national, observational, registry-based matched case–control study.

The Danish universal healthcare system, using national health registers.

We included 2551 individuals who underwent first-time LEA in 2017–2018 and matched each to two control groups: (1) The Community Controls Group representing the average population who were matched on age, sex and municipality (n=12 748) and (2) a Diabetes Mellitus/Peripheral Arterial Disease (DM/PAD) Control Group matched on age, sex and DM or PAD duration (n=12 478) representing a high-risk population.

Presence of healthcare, sociodemographic and medication-related risk factors associated with LEA was evaluated across three time periods leading up to amputation: the Immediate (0–2 years prior), Early (2–5 years prior) and Long-term (5–10 years prior) risk period.

Polypharmacy and antibiotic use—particularly dicloxacillin targeting Staphylococcus aureus—were strongly associated with LEA across all time periods. Dicloxacillin was prescribed on average 7.8 years prior to major amputation, with long-term ORs of 2.99 (95% CI 2.51 to 3.56) and 2.07 (95% CI 1.75 to 2.46) compared with community and DM/PAD controls. Opioid and paracetamol use also showed strong associations. Individuals with LEA were more likely to live alone and have lower educational attainment. Frequent dental visits were inversely associated with risk.

This study identifies characteristics associated with LEA, including long-term exposure to dicloxacillin and opioid analgesics, alongside polypharmacy and socioeconomic disadvantage. These factors were detectable up to 10 years before amputation and may serve as early indicators for risk identification and guide targeted general practitioner interventions.

Cardiac rehabilitation has traditionally been administered through face-to-face consultations with a specialised team of nurses, medical doctors and physiotherapists. However, the healthcare system is undergoing a significant digital transformation, which may lead to telemedicine (TM) becoming a cornerstone of healthcare. However, successful TM requires digital competencies among both patients and health professionals. This trial will examine the best methods of onboarding patients to TM by way of a co-designed cardiac telerehabilitation model with a family-focused approach.

The aim is to investigate how patients and family members could benefit from using TM, including video consultations and home monitoring, for cardiac rehabilitation. We ask how patients’ health literacy, digital health literacy, health-related quality of life and family support would be affected by a shift to TM.

The primary outcome is the Health Literacy Questionnaire, and secondary outcomes are the eHealth Literacy Questionnaire, European Quality of Life—Five Dimensions Scale, and the Iceland—Family Perceived Support Questionnaire. The sample size is 73 patients in each group. Data will be analysed with ² or Fisher’s exact tests, a t-test or a Wilcoxon signed-rank test, depending on the distribution.

Approval for this trial was obtained from the Danish Data Protection Agency (P-2023-65) and the National Committee on Health Research Ethics (F-23075094). The trial will be conducted in compliance with the Declaration of Helsinki. The trial results—whether positive, neutral or negative—will be submitted for publication. The trial has been registered at ClinicalTrials.gov (NCT06320652).

(NCT06320652).