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Dr. Ebraheim’s animated educational video describing posterior shoulder instability - “Jerk Test“. The Jerk test is a provocative test used to diagnose posterior shoulder instability. Traumatic posterior instability is less common than anterior instability and it is also underdiagnosed. Posterior instability of the shoulder is common in athletes such as football players (linemen in the blocking position). Posterior instability of the shoulder is usually traumatic in the majority of patients.
