Eagles running back Brian Westbrook may be forced to retire. Westbrook's 2009 season was marred by two concussions and a nagging ankle injury. According to WIP-AM's Howard Eskin, however, it's the running back's left knee that could end his career. Citing sources, Eskin said that Westbrook would seek out other medical opinions on his knee in the next few weeks. According to the report, Westbrook's ailing knee kept him on the sideline for almost all of the first-round playoff loss to Dallas.