Flail arm refers to a severe and symmetric wasting and weakness of the arms without significant functional involvement of other regions, seen in one variant of motor neurone disease, the "flail arm syndrome", also known as Vulpian-Bernhart’s form. Men are reported to be much more frequently affected than women, and this group may show improved survival compared to other MND patients. Alternative designations for this syndrome include amyotrophic brachial diplegia, dangling arm syndrome, and neurogenic man-in-a-barrel syndrome.
Hu MTM, Ellis CM, Al-Chalabi A, Leigh PN, Shaw CE. Flail arm syndrome: a distinctive variant of amyotrophic lateral sclerosis. Journal of Neurology, Neurosurgery and Psychiatry 1998; 65: 950-951