Incidence of backpack palsy and neuralgic amyotrophy in the Dutch military population.

Background: Brachial plexopathies, including backpack palsy (BPP) and neuralgic amyotrophy (NA), are not uncommon in military populations. BPP is caused by compression or stretching of the brachial plexus, while NA is an inflammatory neuropathy potentially triggered by physical strain or infection. Previous studies suggest these conditions have significant incidence rates in military personnel, but further data are limited. Methods: This prospective observational study tracked the incidence of BPP and NA among Dutch military personnel from 1 June 2022 to 1 January 2025. All patients with new symptoms of brachial plexopathy were included. Incidence was calculated using the total number of active military personnel during the study period. The incidence was calculated for different age categories. Results: A total of 68 cases of BPP and NA were identified over the 31-month period. The calculated incidence of BPP and NA was 28.2 and 35.7 per 100 000 person-years, respectively. BPP was most common in soldiers under 25 (89.6 per 100 000 person-years), while NA was more evenly distributed across age groups. Conclusions: This study confirms a high incidence of plexopathies in the Dutch military population, particularly BPP in younger soldiers. These findings underscore the need for targeted prevention strategies to maintain operational readiness.