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In page Hill–Sachs lesion:

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The incidence of Hill–Sachs lesion is not known with certainty. It has been reported to be present in 40% to 90% of patients presenting with anterior shoulder instability, that is subluxation or dislocation.[1][2] In those who have recurrent events, it may be as high as 100%.[3] Its presence is a specific sign of dislocation and can thus be used as an indicator that dislocation has occurred even if the joint has regained its normal alignment. Large, engaging Hill-Sachs fractures can contribute to shoulder instability and will often cause painful clicking, catching, or popping.[citation needed] The average depth of Hill–Sachs lesion has been reported as 4.1 mm.[4]