Loss of the range of motion of the shoulder is one of the commonest symptoms of shoulder arthritis. Although we are most interested in the motion between the humerus and the scapula, it is easiest to measure the motion between the humerus and the thorax as shown in these figures copyrighted by Steve Lippitt.
Forward elevation
Abduction
External rotation
Internal rotation up the back
Internal rotation in abduction
External rotation in abduction
Cross-body adduction
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