Shoulder Stability

SHOULDER STABILITY

 

 

 

 
FACTORS AFFECTING STABILITY OF THE SHOULDER

Factor/anatomical
structure
Importance relative to
stability
Pathology/Abnormality

Rotator Interval Complex- including Coraco-Humeral ligament and Superior Gleno- Humeral ligament

Limits external rotation and inferior translation in adduction and posterior translation inflexion

Lesion of the rotator interval

Middle glenohumeral
ligament
Limits external rotation and inferior translation in adduction and anterior translation in mid-abduction.

 

Bankart lesion capsular injury

Inferior glenohumeral ligament complex

Limits anterior, posterior and inferior translation in abduction

 

Bankout lesion, capsular injury
Posterior capsule
Limits posterior translation in the flexed, abducted and internally rotated shoulder

 

Capsular laxity or constriction
Rotator cuff
Centring of the humerus into the glenoid, compression

 

Tendonitis tear, neurological deficit
Long head of biceps Restrains anterior and superior translation, stabilizes the abducted arm , proprioception.
SLAP lesion Tendonitis Rupture
Negative intra-articular
pressure
Vacuum effect
Injury to capsule or joint
surfaces
Osseous configuration Concavity/convex rule of glenohumeral joint congruency
Glenoid dysplasia, fracture, Hill-sachs lesion, reverse Hill-sachs lesion, osteoarthritis.
Glenoid labrum
Increase depth of glenoid, creates a conforming seal with the head of the humerus, pointof attachment for ligaments and capsule
SLAP lesion ,Bankart Lesion.