Shoulder cuff tendinopathy Flashcards
rotator cuff muscles
Supraspinatus (SST)
Infraspinatus (IST)
Teres Minor (TM)
Subscapularis (SSP)
where do the supraspinatus and infraspinatus fuse
15mm proximal
To their insertions
what 2 muscles are inseparable
infraspinatus and teres minor
Proximal to their MT junction
which muscle is most prone to injury
supraspinatus
subacromial space
Space between the under surface of the acromium and humeral head = 1cm
contents of subacromial space
Supraspinatus muscle
Long head of the biceps muscle
Subacromial bursa
Coracohumeral ligament
largest bursa in the body
subacromial bursa - separates deltoid above Rotator Cuff below
very pain sensitive
rotator cuff tendinopathy
Pain and weakness in the shoulder,
movements associated with RC tendinopathy
most commonly associated with elevation flexion abduction external rotation due to excessive load on rotator cuff tissues
characteristic of RC tendinopathy
Overuse injury
Collagen matrix disorganised
Tendon weaker
↑ apoptosis (cell death)
cause of RC tendinopathy
Altered loading
extrinsic factor
intrinsic mechanisms
extrinsic factors
as those causing compression of the RC tendons,
examples of altered loading
sports and occupations with high levels of shoulder loading
intrinsic factors
age related - tensile tendon strength, collagen content reduced vascularity - deficient vascular supply response of the tendons to tensile load other factors genetics
extrinsic factors
Anatomical factors anatomical variants of the acromion and AC joint spurs (associated with osteoarthritis) Thoracic spine kyphosis Abnormal scapular and humeral kinematics Internal impingement Unique subset of patients Younger, related to sports
signs and symptoms of rotator cuff tendinopathy in subjective examination
Pain in upper arm
Pain worse with arm movements, esp overhead
Pain can increase at night
signs and symptoms of rotator cuff tendinopathy in physical examination
Pain with Shoulder Movements
Painful arc: 70-120°- most accurate test (Hermans et al, 2013)
Pain and weakness with resisted testing
Resisted External Rotation most accurate
Tender supraspinatus tendon insertion
Shoulder Impingement Syndrome (SIS) aka
Subacromial Impingement
Rotator Cuff Impingement
Shoulder Impingement
Where a structure is compressed in the subacromial space between the acromium / coracoacromial arch / AC jt. (above) humerus (below) during movement
‘External Impingement’
clinical tests for RC tendinopathy
RESISTED STRENGTH TESTING
Resisted Abduction, Medial Rotation, Lateral Rotation in neutral AND 90° abd
Empty can/Full Can
Painful Arc
clinical tests for Shoulder Impingement Syndrome
Hawkins –Kennedy
Painful Arc
clinical tests for RC tear
more weakness than pain
Lift- off sign
External rotation lag sign
Drop arm test
painful arc test
Onset of pain as the humeral head passes under the acromial arch between 70 – 120° abduction
As the arm rotates and elevates further the impingement is reduced
May be more pronounced on lowering arm
empty can test
Arm in 90° flexion, midway abduction, internally rotated.
Apply resisted abduction- it should be painfree and show no weakness.
Positive if it reproduces the patient’s symptoms and /or
hawkins and kennedy test for shoulder impingement syndrome
Patient’s arm in 90° abduction over your arm with your hand on their shoulder
Medially rotate their humerus, then move anteriorly repeating medial rotation.
Positive if it reproduces the patient’s symptoms
how useful is imaging?
Poor correlation between imaging and Symptoms