12 Questions
What contributes to increasing the mobility of the shoulder?
Scapula movement
Without scapula movement, how much shoulder elevation would the glenohumeral joint achieve?
60°
What acts like a fulcrum for the clavicle during arm elevation?
Acromioclavicular joint
Which joint shifts as the axis of motion above 90° during arm elevation?
Acromioclavicular joint
What is the timing of movement between the GHJt and scapula referred to as?
Scapulohumeral rhythm
Which structure allows room in the subacromial space for soft tissue structures?
Scapula
What is the main role of both upper and lower trapezius in scapula movement?
Upward rotation
When does the action of the lower trapezius change from a scapular depressor to upward rotator?
Arm movement above 90°
Which muscles form a force couple with the upper and lower trapezius to assist upward rotation of the shoulder?
Serratus anterior and levator scapulae
What is a common observation associated with scapular dyskinesis during shoulder movements?
Winging (prominent medial border)
What is defined as dysrhythmia in the context of scapula movement?
Rapid downward rotation during arm lowering
What might contribute to scapular dyskinesis, causing the scapula to rest/move in an anteriorly tilted position?
Tight pectoralis minor muscle
Learn about the important role of the scapula in shoulder movement. Understand how scapula movement contributes to increasing mobility and maintaining muscle length tension relationships in the shoulder. Discover how the scapula allows room for soft tissue structures in the subacromial space.
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