Dislocation Shoulder Good

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http://morphopedics.wikidot.com/shoulder-dislocation

I. Description

True shoulder dislocation occurs when the head of the humerus becomes dislodged from the glenoid cavity. It is

the joint that is most prevalent for dislocation. The shoulder normally dislocates anteriorly but it can also be

displaced posteriorly or inferiorly. If the humerus is dislocated once, there is a greater chance that it can later be

dislocated again, especially if the person is 30 years or younger. Many times when a shoulder dislocation occurs,

ligaments and other tissues are damaged and movement of the humerus is highly limited. Once the shoulder is

relocated normal function is usually restored but structures around the glenoid area may still be damaged. The two

most common injuries associated with an anteriorly dislocated shoulder are a Bankart lesion and a Hill-Sachs

lesion. A Bankart lesion occurs when the anterior labrum is torn. A Hill-Sachs lesion takes place when the humeral

head impacts the glenoid fossa causing a fracture of the head of the humerus. These lesions can also occur in the

posterior joint with posterior dislocation, and are known as reverse Bankart and Hill-Sachs lesions.1,2,4

All About Shoulder Dislocation

II. Anatomy
http://morphopedics.wikidot.com/shoulder-dislocationhttp://morphopedics.wikidot.com/shoulder-dislocationhttp://morphopedics.wikidot.com/shoulder-dislocation


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The anatomy of the glenohumeral joint consists of the humeral head of the humerus and the glenoid fossa of the

scapula.

These two structures together create a cavity with a surrounding capsule. Attached to the glenoid cavity is the

glenoid labrum which acts as a fibrocartilaginous bumper between the humeral head and the glenoid fossa.

The capsule is supported by the rotator cuff muscles which are the supraspinatus, infraspinatus, subscapularis, andteres minor.

The deltoid muscle and the biceps tendon also offer some support for the capsule.

The superior glenohumeral ligament (SGHL), middle glenohumeral ligament (MGHL), and inferior glenohumeral

ligament (IGHL) are three structures that provide support as well.3

III. Prevalence & Etiology

Anterior dislocations occur in 98% of shoulder dislocations. The other 2% of shoulder dislocations take place

posteriorly. The majority of dislocations occur from a traumatic incidence. Forced external rotation and abduction of

the humerus is the most prevalent cause of anterior dislocation. About 5% occur atraumatically, usually because of

excessive laxity of the capsule. Recurrence of dislocation can also be problematic. In people aged 20 years or

younger, dislocation can recur in 66% to 100% of cases. For people between 20 and 40 years old 13% to 63% of

dislocations recur and for people 40 years and over 0% to 16% dislocate their shoulder again.4

IV. Clinical Presentation

Most patients will state that they heard a popping sound at the time of injury. Anterior dislocation is the most

common form of shoulder dislocation and normally the patient will have had their arm abducted and externally

rotated at the time of injury. It may also present this way in clinic if it has not been relocated. They may have also

felt numbness or tingling down the arms after injury if a nerve was affected. If the shoulder was not put back into

place, then AROM will be decreased and painful, and the humeral head may be palpable anteriorly. Brusing may be

visible if blood vessels were ruptured. With a posterior dislocation, ROM and strength tests are usually normal

unless a rotator cuff muscle or nerve has been damaged. Crepitus may be present when the shoulder is internally

rotated and the posterior joint line may be tender to palpation. If the humeral head has not been relocated, the

humerus may appear internally rotated and will not be able to externally rotate.1,2,5

V. Diagnostic Tests

With both anterior and posterior shoulder instability, an anteroposterior (AP) view and a Y-view image should be

obtained. The AP view can show anterior dislocation and a reverse Hill-Sachs sign for posterior dislocation. The Y-

view can show a Hill-Sachs lesion for anterior dislocation and a posterior dislocation.6,7

Anterior Dislocation


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Hill-Sach's Lesion

Posterior Dislocation

Reverse Hill-Sach's Lesion


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CT scans can also be used to assess the integrity of the labrum. An MRI shows Bankart lesions and any soft tissue

injuries.6,7

CT Labrum

MRI Bankart Lesion

VI. Special Orthopedic Tests

Anterior Instability

The three tests that are most reliable for anterior shoulder instability are the apprehension, relocation, and anterior

release tests.8,9

Apprehension Test Pain or apprehension indicate a positive test.

Relocation Test Decreased pain or apprehension indicate a positive test.

Anterior Release Test Pain or apprehension upon release of the humeral head indicate a positive test.


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Posterior Instability

The two most reliable tests for posterior instability are the posterior stress test and the jerk test.5

Posterior Stress Test (Posterior Apprehension Test) Pain or apprehension indicates a positive test.

Jerk Test A clunk, or jerk, upon axial load or horizontal adduction indicates a positive test. Another clunk mayalso occur upon relocation (horizontal abduction).

VII. Conservative Treatment

Immobilization

If immobilization is the sole treatment, the arm is usually immobilized anywhere from 2 to 6 weeks. Combined with

exercise, it will usually be immobilized for a lesser time period. For anterior dislocations, the humerus is normally

placed in a traditional internally rotated position. However, new studies are being conducted which may show thatplacing the humerus in an externally rotated position may be more beneficial for healing especially if a Bankart

lesion is present. For posterior dislocations the humerus is normally placed in a slightly extended and externally

rotated position.4,5,10

Exercise

Exercise is normally used in conjunction with immobilization. The shoulder will usually be immobilized for 1-3

weeks. During this time period, wrist and elbow range of motion exercises can be performed so that it is not lost.

After immobilization, range of motion of the shoulder can begin followed by strengthening. In the case of anterior


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dislocation, strengthening programs should emphasize the internal rotators, adductors, scapular muscles. For

posterior dislocation, programs to strengthen the external rotators, posterior deltoid, and scapular muscles are

performed. Conservative protocols may take up to 3 months for full recovery.4,5,10

click on the link below to view PT management of shoulder dislocation:

Physical Therapy Management of Shoulder Dislocation

VIII. Surgical Treatment

For an anterior dislocation, open or arthroscopic surgeries may be performed. During an open Bankart repair, the

subscapularis is detached so that the labrum can be repaired on the anterior glenoid. The shoulder is reduced and

sutures are applied to hold it in place. In an arthroscopic procedure, portals are made and the anterior labrum is

reattached and the humerus is reduced.

For a posterior dislocation, open surgery or arthroscopic surgery may be performed as well. In an open

posteroinferior capsular shift, the humerus is placed in 20 degrees of abduction. The incision is made in the

posterior axilla. The humerus is placed back into the capsule and the posterior capsule is repaired. During

arthroscopic surgery, three or four portals are used anteriorly and posteriorly. If a reverse Bankart lesion is present

it is then repaired with sutures. The humerus is placed back into the capsule and the portals are stitched back up.

Both open and arthroscopic surgeries have their advantages and disadvantages. With open surgery there is alesser rate of redislocation. However, there is usually a greater loss in external rotation than with arthroscopic

surgery. Treatment following surgery is basically the same as a conservative protocol consisting of range of motion

and strengthening exercises for the shoulder. Depending on the type of surgery, full recovery time may take

anywhere from 4 to 9 months.4,5,10

Arthroscopic Bankart Repair Animation

IX. Additional Web-Based Resources

For information all about shoulder dislocations visit:http://www.ori.org.au/bonejoint/shoulder/contents.htm

and

http://shoulderdislocation.net/

For an extensive list of special orthopedic tests visit:http://www.shoulderdoc.co.uk/article.asp?section=497.For treatment protocols visit:http://www.pt.armstrong.edu/davies/pdf/Anterior%20Shoulder%20Dislocation.pdf

andhttp://www.tsaog.com/phyForms/Acute%20Anterior%20Shoulder%20Dislocation%20Physical%20Therapy%2

0Protocol.pdf

X. References

1. Seade EL, Josey R. Shoulder Dislocation. Medscape Reference Website. Available

at:http://emedicine.medscape.com/article/93323-overview. Accessed October 28th, 2011.

2. Mayo Clinic Staff. Dislocated Shoulder. Mayo Foundation for Medical Education and Research. Available

at:http://www.mayoclinic.com/health/dislocated-shoulder/DS00597. Accessed November 26th, 2011.

3. Sizer PS, Phelps V, Gilbert K. Diagnosis and management of the painful shoulder. Part 1: clinical anatomy and

pathomechanics. Pain Practice, 2003;3(1):40-57.

4. Hayes K, Callanan M, Walton J, Paxinos A, Murrell G. Shoulder instability: management and rehabilitation.Journal of Orthopaedic & Sports Physical Therapy, 2002;32(10):1-13.

5. Millett PJ, Clavert PC, Hatch RGF, Warner JJP. Recurrent posterior shoulder instability. Journal of the American

Academy of Orthopaedic Surgeons, 2006;14(8):464-476.

6. Satterwhite YE. Evaluation and management of recurrent anterior shoulder instability. Journal of Athletic

Training, 2000;35(3):273-277.

7. Tseng GY, Peh WCG. Shoulder Dislocation Imaging. Medscape Reference Website. Available

at:http://emedicine.medscape.com/article/395520-overview. Accessed November 26, 2011.

8. Hegedus EJ, Goode A, Campbell S, Morin A, Tamaddoni M, Moorman CT, Cook C. Physical examination tests of

the shoulder: a systematic review with meta-analysis of individual tests. Journal of Sports Medicine,
http://morphopedics.wikidot.com/physical-therapy-management-of-shoulder-dislocationhttp://morphopedics.wikidot.com/physical-therapy-management-of-shoulder-dislocationhttp://www.ori.org.au/bonejoint/shoulder/contents.htmhttp://www.ori.org.au/bonejoint/shoulder/contents.htmhttp://www.ori.org.au/bonejoint/shoulder/contents.htmhttp://shoulderdislocation.net/http://shoulderdislocation.net/http://www.shoulderdoc.co.uk/article.asp?section=497http://www.shoulderdoc.co.uk/article.asp?section=497http://www.shoulderdoc.co.uk/article.asp?section=497http://www.pt.armstrong.edu/davies/pdf/Anterior%20Shoulder%20Dislocation.pdfhttp://www.pt.armstrong.edu/davies/pdf/Anterior%20Shoulder%20Dislocation.pdfhttp://www.pt.armstrong.edu/davies/pdf/Anterior%20Shoulder%20Dislocation.pdfhttp://www.tsaog.com/phyForms/Acute%20Anterior%20Shoulder%20Dislocation%20Physical%20Therapy%20Protocol.pdfhttp://www.tsaog.com/phyForms/Acute%20Anterior%20Shoulder%20Dislocation%20Physical%20Therapy%20Protocol.pdfhttp://www.tsaog.com/phyForms/Acute%20Anterior%20Shoulder%20Dislocation%20Physical%20Therapy%20Protocol.pdfhttp://www.tsaog.com/phyForms/Acute%20Anterior%20Shoulder%20Dislocation%20Physical%20Therapy%20Protocol.pdfhttp://emedicine.medscape.com/article/93323-overviewhttp://emedicine.medscape.com/article/93323-overviewhttp://emedicine.medscape.com/article/93323-overviewhttp://www.mayoclinic.com/health/dislocated-shoulder/DS00597http://www.mayoclinic.com/health/dislocated-shoulder/DS00597http://www.mayoclinic.com/health/dislocated-shoulder/DS00597http://emedicine.medscape.com/article/395520-overviewhttp://emedicine.medscape.com/article/395520-overviewhttp://emedicine.medscape.com/article/395520-overviewhttp://emedicine.medscape.com/article/395520-overviewhttp://www.mayoclinic.com/health/dislocated-shoulder/DS00597http://emedicine.medscape.com/article/93323-overviewhttp://www.tsaog.com/phyForms/Acute%20Anterior%20Shoulder%20Dislocation%20Physical%20Therapy%20Protocol.pdfhttp://www.tsaog.com/phyForms/Acute%20Anterior%20Shoulder%20Dislocation%20Physical%20Therapy%20Protocol.pdfhttp://www.pt.armstrong.edu/davies/pdf/Anterior%20Shoulder%20Dislocation.pdfhttp://www.shoulderdoc.co.uk/article.asp?section=497http://shoulderdislocation.net/http://www.ori.org.au/bonejoint/shoulder/contents.htmhttp://morphopedics.wikidot.com/physical-therapy-management-of-shoulder-dislocation


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2008;42(1):80-92.

9. Farber AJ, Castillo R, Clough M, Bahk M, McFarland EG. Clinical assessment of three common tests for traumatic

anterior shoulder instability. Journal of Bone and Joint Surgery, 2006;88(7):1467-1474.

10. Handoll HHG, Al-Maiyah MA. Surgical versus non-surgical treatment for acute anterior shoulder dislocation. The

Cochrane Collaboration, 2010;(5):1-34.

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Dislocation Shoulder Good