Table 9.

Modified Samilson and Prieto classification according to Buscayret

Grade	Description
1	Inferior humeral or glenoid exostosis, or both, measuring less than 3 mm in height.
2	Inferior humeral or glenoid exostosis, or both, between 3 and 7 mm in height, with slight glenohumeral joint irregularity.
3	Inferior humeral or glenoid exostosis, or both, more than 7 mm in height, with narrowing of the glenohumeral joint and sclerosis.
4	Bone on bone joint space narrowing with or without osteophytes.

Modified Samilson and Prieto classification according to Buscayret (Table 9): the Buscayret modification of the Samilson-Prieto classification subdivides the severe glenohumeral OA stage into two substages.