The following video is part of our "Motley Fool Conversations" series, in which, David Williamson, health-care editor and analyst and Brendan Byrnes, industrials editor and analyst, discuss topics across the investing world.

In today's edition, David and Brendan discuss some of the worst health-care stocks of 2011. These stocks fit relatively neatly into three catagories: failure to launch, trial troubles, and home health-care scare. This video focuses on trial troubles, i.e., companies with promising drug candidates that either have struggled acing clinical trials or getting past the FDA gatekeepers. They also discuss which of the downtrodden stocks have brighter days ahead in 2012.

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This article represents the opinion of the writer, who may disagree with the “official” recommendation position of a Motley Fool premium advisory service. We’re motley! Questioning an investing thesis -- even one of our own -- helps us all think critically about investing and make decisions that help us become smarter, happier, and richer.