Used to describe glenoid fractures of scapula. Type 1, anterior margin avulsion; type 2, horizontal fracture through glenoid fossa with displacement of inferior fragment; type 3, oblique fracture running through glenoid and onto superior scapular border (seen with acromioclavicular fractures); type 4, transverse running through medial border of blade; type 5, type 4 with added separation of inferior glenoid fragment.