Arm wrestling is common game which is competed withfriends and also become a common game and evenprofessionalsport.On the games, unusual injuries are sometimespresented.Materials and Methods: We studied two types ofhumeral fractures. One of these is fracture of themedial epicondyle ofhumerus. Another type is spiral fracture of thehumeral shaft.Results: There were 4 cases treated for fracture-separation of the medial humeral epicondyle. Patients were all male, aged 12-15 years.