The seeming simplicity of day-to-day movement can belie the complexity of the structures that facilitate motion. More than just a framework around which the body develops, the human skeleton has evolved over time to allow humans to walk and stand upright. Muscles likewise perform a range of functions, without which the body could not manage. This comprehensive book details the anatomy and mechanisms that allow bones and muscles to operate naturally and examines the consequences of disease and injury on these fundamental components of the human body.