Traumatic injuries to the shoulder girdle are common [1]. The acromioclavicular joint is the primary connection between the arm and the thorax, and the glenohumeral joint is inherently unstable, owing to the disproportionate size of the articular surfaces of this spheroidal joint. The pattern of injury depends on the mechanism of trauma and age of the patient [2]. The incidence of shoulder injuries is difficult to determine because some injury types, such as low-grade joint separations, are underreported when patients do not seek immediate medical treatment [3]. The majority of injuries occur from either a direct impact on a focal point on the shoulder or from a fall on an outstretched hand, resulting in both fractures and dislocations. Shoulder injuries have no particular predilection to the sex of the patient, but age is an important factor [4]. For instance, glenohumeral joint dislocation and acromioclavicular joint separation occur in young people, whereas fractures most frequently occur in the elderly. In this chapter, a review of the osseous injuries of the shoulder that affect the acromioclavicular, sternoclavicular, and glenohumeral joints is presented along with some of the more commonly used classification systems that describe related injury patterns.