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Radial head fractures are common, accounting for approximately one-third of all elbow fractures, with an estimated incidence of 2.5 to 2.9 per 10.000 people per year (1-3). They generally occur after a fall on the outstretched arm. They may be isolated or associated with more complex injuries such as fractures of the olecranon or coronoid process, elbow dislocation, ligament rupture, vascular injuries or nerve injuries (4, 5). Several classifications (6-10) have been introduced to describe radial head fractures, nearly all derived from the classification proposed by Mason in 1954 (6). A Mason type I fracture is a fissure or marginal sector fracture without displacement. Type II fractures are articular fractures involving a part of the head with displacement. Comminuted articular fractures involving the whole head of the radius are Mason type III fractures. Broberg and Morrey (8) modified Mason’s classification, quantifying displacement of 2 mm or greater as articular stepoff or gap, and indicating that fracture fragments representing less than 30% of the articular surface should not be considered type II. It is generally agreed that type I fractures can be successfully treated non operatively with early mobilization (11-15). For Mason type III fractures potential treatment modalities include open reduction and internal fixation, radial head excision, or radial head replacement (16-19). The best treatment of type II fractures having no association with other fractures or ligament injuries (known as isolated fractures) is still debated. Historically, the treatment of choice for Mason Type II fractures was radial SUMMARY: Nonsurgical treatment of Mason type II radial head fractures in athletes. A retrospective study.