ideberg classification ideberg classification the ideberg classification is a system of categorizing scapula fractures involving the glenoid fossa. classification type description ia anterior rim fracture ib posterior rim fracture ii fracture through glenoid exiting scapula laterally iii fracture through glenoid exiting scapula superiorly iv fracture through glenoid exiting scapula medially va combination of types ii and iv vb combination of types iii and iv vc combination of types ii, iii and iv vi severe comminution