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Table 1 Question answered yes/no (1/0) defining the fracture groups of proximal humerus fractures. The “0”s have been omitted for clarity

From: Validity of humerus fracture classification in the Swedish fracture register

  A1 A1.3 A2 A3 B1 B2 B3 C1 C2 C2.3 C3 C3.1
Two-part extra-articular 1 1 1 1         
Tuberosity only 1            
Three-part, extra-articular – bifocal      1 1 1      
Four-part, articular         1 1 1 1  
Glenohumeral dislocation   1      1     1  
Metaphyseal impaction/stable    1   1    1     
Anatomical neck only             1
Head split          1    
Proximal segment (inside the square) 1 1 1 1 1 1 1 1 1 1 1 1