Gerber describes a new form of intraarticular impingement in patients with unexplained anterior shoulder pain. In 16 patients, arthroscopy documented contact between the deep surface of the subscapularis and biceps pulley against the anterosuperior glenoid rim during flexion and internal rotation. The paper proposes this as the anterior counterpart to posterosuperior impingement and a cause of articular-side subscapularis tears.
When a patient has anterior shoulder pain reproduced by flexion and internal rotation that does not respond to subacromial injection, think intraarticular impingement, not classic subacromial disease.
This paper defines anterosuperior glenoid impingement as the anterior mirror of Walch's posterosuperior impingement. Instead of the deep supraspinatus hitting the posterosuperior glenoid in abduction and external rotation, the deep subscapularis and biceps pulley hit the anterosuperior glenoid in flexion and internal rotation.
The mental model to carry: articular-side, proximal subscapularis tears with an associated pulley lesion and biceps changes are a linked pathology, not three separate problems. A torn pulley is also the prerequisite for biceps subluxation.
Be skeptical of normal liftoff and belly-press tests. They were normal in most of these patients despite real tendon damage, so imaging and arthroscopy carry the diagnosis. Remember this is a preliminary descriptive series with no standardized treatment and short follow-up, so it establishes a mechanism rather than a validated management algorithm.
Gerber describes a new form of intraarticular impingement in patients with unexplained anterior shoulder pain. In 16 patients, arthroscopy documented contact between the deep surface of the subscapularis and biceps pulley against the anterosuperior glenoid rim during flexion and internal rotation. The paper proposes this as the anterior counterpart to posterosuperior impingement and a cause of articular-side subscapularis tears.
When a patient has anterior shoulder pain reproduced by flexion and internal rotation that does not respond to subacromial injection, think intraarticular impingement, not classic subacromial disease.
This paper defines anterosuperior glenoid impingement as the anterior mirror of Walch's posterosuperior impingement. Instead of the deep supraspinatus hitting the posterosuperior glenoid in abduction and external rotation, the deep subscapularis and biceps pulley hit the anterosuperior glenoid in flexion and internal rotation.
The mental model to carry: articular-side, proximal subscapularis tears with an associated pulley lesion and biceps changes are a linked pathology, not three separate problems. A torn pulley is also the prerequisite for biceps subluxation.
Be skeptical of normal liftoff and belly-press tests. They were normal in most of these patients despite real tendon damage, so imaging and arthroscopy carry the diagnosis. Remember this is a preliminary descriptive series with no standardized treatment and short follow-up, so it establishes a mechanism rather than a validated management algorithm.