Classification of Hawkins and Bokor for Instability of the Glenohumeral Joint

Hawkins and Bokor graded intstability of the glenohumeral joint. The authors are from St. Joseph's Hospital in London, Canada.

Parameters:

(1) humeral head relative to the rim of the glenoid under passive stress

(2) reduction of humeral head on removal of stress

Humeral Head Relative to Rim of the Glenoid	Reduction on Removal of Stress	Grade of Instability
small amount of translation	NA	0
head rides up the slope of the glenoid but does not go over the rim	NA	I
head rides up and over the glenoid rim	reduces	II
head rides up and over the glenoid rim	does not reduce (remains dislocated)	III

The higher the grade of the instability the more severe it is.

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