Table 3.

Kellgren and Lawrence classification

Stage	Description
0	No radiological findings of osteoarthritis.
I	Doubtful narrowing of the joint space and possible osteophytic lipping.
II	Definite osteophytes and possible narrowing of the joint space.
III	Moderate multiple osteophytes, definite joint space narrowing, small pseudocystic areas with sclerotic walls and possible bone contour deformity.
IV	Large osteophytes, marked joint space narrowing, severe sclerosis and definite deformity of bone contour.

Kellgren and Lawrence classification (Table 3): this classification, originally designed by Kellgren to evaluate OA of the hand joints, is among the most widely used also for the evaluation of OA of the glenohumeral joint among others. It takes into account features such as osteophytes, cysts and joint space narrowing.