Dynamic Arthrography Classification
Roberts, Shriner's Hospital, Springfield, MA
Type I
Type 2
Type 3
containable in all positions
containable in abduction and/or medial rotation
noncontainable

The Herring grade and arthrographic sphericity proved tobe the best predictors of final outcome.

- Ismail, MacNicol; JBJS 80B 310; 1998

Type I
Type 2
Type 3
containable in all positions (normal abduction)
containable in abduction and/or medial rotation
noncontainable (hinged abduction)