Which description best characterizes internal subacromial impingement?

Which description best characterizes internal subacromial impingement?

• A. External Impingement Under the Coracoacromial Arch Due to Subacromial Space Narrowing
• B. Internal Impingement Via Pinching RTC Between Humeral Head and Glenoid in the Late Cocking Phase of Throwing
• C. Neer's Sign Is Specific for External Impingement
• D. Nociplastic Pain Is a Type of Nociceptive Pain

Answer: (B)

Internal impingement happens when the undersurface of the rotator cuff is pinched between the humeral head and the posterior-superior rim of the glenoid inside the shoulder joint, typically in the late cocking (abduction with maximal external rotation) phase of throwing. This intra-articular contact is characteristic of overhead athletes and explains posterior shoulder pain that worsens with late-cocking movements. This is different from external impingement, where the bony arch beneath the acromion compresses the cuff against the coracoacromial arch during arm elevation, often with a positive Neer sign. Nociplastic pain describes a different pain mechanism not tied to a mechanical impingement. So the description that best fits internal impingement is the pinching of the rotator cuff between the humeral head and the glenoid rim in the late cocking phase of throwing.

Internal impingement happens when the undersurface of the rotator cuff is pinched between the humeral head and the posterior-superior rim of the glenoid inside the shoulder joint, typically in the late cocking (abduction with maximal external rotation) phase of throwing. This intra-articular contact is characteristic of overhead athletes and explains posterior shoulder pain that worsens with late-cocking movements. This is different from external impingement, where the bony arch beneath the acromion compresses the cuff against the coracoacromial arch during arm elevation, often with a positive Neer sign. Nociplastic pain describes a different pain mechanism not tied to a mechanical impingement. So the description that best fits internal impingement is the pinching of the rotator cuff between the humeral head and the glenoid rim in the late cocking phase of throwing.