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24 Cards in this Set
- Front
- Back
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Glenoid fossa is directed ______________________ Humeral head faces ___________________________ |
__antero-laterally with slight upward rotation. __medially, posteriorly and superiorly. |
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Resting position of GH joint |
~55° abduction 30° horizontal adduction slight external rotation |
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Closed Packed Position of GH joint |
max abduction and external rotation |
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Capsular pattern of GH joint (frozen shoulder) |
External rotation> abduction>internal rotation |
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GH Flexion degrees |
~120° GH movement, scapulothoracic is ~60° with a 2:1 ratio, 180° total |
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Prime movers of GH Flexion |
Anterior deltoid pectoralis Major (clavicular head) coracobrachialis biceps brachii |
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GH extension degrees |
~65 ° actively, ~80° passively |
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GH extension prime movers |
posterior deltoid trees major latissimus dorsi long head of triceps pectoralis major (sternocostal portion) |
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GH Abduction degrees |
~120° (when in ER) |
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GH Abduction prime movers |
supraspinatus lateral deltoid |
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GH Adduction degrees |
0° pure adduction |
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GH Adduction prime movers |
posterior deltoid anterior deltoid pectoralis major long head of triceps coracobrachialis trees major latissimus dorsi |
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GH External rotation degrees |
~60-70° of pure ER ~90° when shoulder abducted |
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GH External rotation prime movers |
posterior deltoid teres minor infraspinatus supraspinatus (between neutral and full ER) |
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GH Internal rotation degrees |
75-85° of pure IR |
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GH Internal rotation prime movers |
anterior deltoid pectorals major trees major latissimus dorsi subscapularis |
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Arthrokinematics of flexion- type of movement |
most of the motion occurring is a spinning of the humeral head around a fixed point. because the spinning is often not 100% pure, rolling and gliding also occurring. |
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Flexion of GH joint roll and glide direction |
Rolls in a anterior/superior direction Glide occurs in a posterior inferior direction At the end ranges of flexion, the direction may switch to a posterior roll and an anterior glide. |
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Adduction of GH joint roll and glide direction |
The humeral head rolls inferiorly while gliding superiorly |
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External rotation of GH joint roll and glide |
Roll posteriorly and glide anteriorly |
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Stabilizing structures |
rotator cuff muscles, capsule, GH ligaments, coracohumeral ligament, coracoacromial arch, long head of the biceps, gleaned labrum, negative intra- articular press, compressive forces |
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Variables which determine the pattern of movements within the fossa |
articular geometry, capsuloligamentous influences, positional influences, muscle dynamics |
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Muscles of the rotator cuff |
supraspinatus, infraspinatus, teres minor and subscapularis (SITS) |
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Rotator cuff stability |
provide static stability through reinforcement of the capsule, provide most of the dynamic GH stability |
