Origin: supraspinous fossa; insertion: superior facet of greater tuberosity; innervation: suprascapular nerve (C5–6). Action: initiates abduction, contributes to humeral head depression and centering. Blood supply: suprascapular artery; critical zone of hypovascularity near tendon insertion (degeneration site). Impingement & tears: subacromial impingement (Neer), degenerative & traumatic tears; clinical tests for integrity. Tests: Jobe (empty can), full can, drop‑arm, external rotation lag (for supra±infra involvement). Imaging: AP, outlet view, MRI for tendon quality/tear, US dynamic assessment. Management: physio (scapular stabilization), injections, arthroscopic repair indications based on symptoms/tear size.
Which structure forms the superior boundary of the subacromial space?
What is the primary action of the supraspinatus muscle?
Which clinical test is specifically designed to assess the integrity of the supraspinatus tendon?
The suprascapular nerve innervates which of the following muscles?
Which of the following is a common site of entrapment for the suprascapular nerve?
What is the critical zone of the supraspinatus tendon?
Which imaging modality is the best for assessing the quality of the supraspinatus tendon?
What does the full can test primarily assess?
Which type of acromion has the highest risk of impingement on the supraspinatus tendon?
In managing a supraspinatus tear, which treatment is indicated for symptomatic tears based on size?
