Load and Shift Test |
Other Names |
Anterior
Shoulder Instability and Posterior Shoulder Instability |
Examination type |
Joint
stability |
Patient & Body Segment Positioning |
The patient
sits with no back support and with the hand of the test arm
resting on the thigh. This test may also be done with the
patient lying supine. Patient must be relaxed. Examiner does
all the motions required to perform test. |
Examiner Position |
The examiner
stands or sits slightly behind the patient (just behind and to
the side). |
Tissues
Being Tested |
supraspinatus, infraspinatus, subscapularis, teres major, teres
minor, articular capsule |
Performing the Test |
Stabilize
the shoulder with one hand over the clavicle and scapula. Use
the other hand to grasp the head of the humerus with the thumb
over the posterior humeral head and the fingers over the
anterior humeral head. The humerus is then gently pushed into
the glenoid to seat it properly in the glenoid fossa (Load).
Push the humeral head anterior (anterior instability tested) or
posteriorly (posterior instability tested) noting the amount of
translation (Shift). |
Positive Test |
Note the
amount of translation: 25% or less anteriorly is normal. Grade
1 is 25 to 50% of the humeral head riding up to the glenoid rim
with spontaneous reduction. Grade II is more than 50 %
translation with spontaneous reduction. Grade III rides over
the glenoid rim & does not spontaneously reduce. For posterior
translation, 50 % is normal. |
Interpretation |
Positive
finding means shoulder feels like it’s dislocating often
described with a sensation of crepitation. Pain related to
overuse in overhead sports may have an overworked rotator cuff
that is trying to maintain shoulder stability. Therefore, a
patient with rotator cuff tendonitis may have underlying
instability. Also provide information on the direction of the
instability. |
Common errors in
performing exam |
Not loading the humerus: in patients with
significant laxity, the humeral head may have a resting position
that is non-concentric. |
Factors possibly
resulting in misinterpretation |
Pre-existing
significant joint laxity; primary impingement |
Related tests |
Anterior Drawer Test, Posterior Drawer Test,
Sulcus Test, Clunk Test, Relocation Test, Apprehension Test. |
References |
Wilk, E Kevin & James R. Andrews. “The Athletes’
Shoulder” Load and Shift Test. pp 52-54; 207, 404.
Prentice,
William E. Arnheim’s Principles of Athletic Training.
Shoulder Complex. Pp.668-717. |
Links: |
http://www.maitrise-orthop.com/corpusmaitri/orthopaedic/112_kelly/kellyus.shtml
http://www.orthoontheweb.com/html/shoulder_pain.html |
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