Score: Proximal humerus fractures
Use: AO (ASIF) classification
A: unifocal fractures
A1: extra-articular unifocal fracture, tuberosity
A2: extra-articular unifocal fracture, impacted metaphyseal
A3: extra-articular unifocal fracture, non-impacted metaphyseal
B: bifocal fractures
B1: extra-articular bifocal fracture, with metaphyseal impaction
B2: extra-articular bifocal fracture, without metaphyseal impaction
B3: extra-articular bifocal fracture, with glenohumeral dislocation
C: articular fractures
C1: articular fracture, with slight displacement
C2: articular fracture, impacted with marked displacement
C3: articular fracture, with glenohumeral dislocationReference
Classification and Diagnosis in Orthopaedic Trauma. Editors: Rahij Anwar, Kenneth W. R. Tuson, Shah Alam Khan. Cambridge University Press, 2008