Drop Sign is used to test the integrity of the supraspinatus muscle of the rotator cuff of the…
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What is Drop Sign?
Drop Sign is used to test the integrity of the supraspinatus muscle of the rotator cuff of the shoulder.
How it's Performed?
- The patient is seated with his or her back to the examiner.
- The affected arm is held at 90 degrees of elevation in the scapular plane and at almost full external rotation with the elbow flexed at 90 degrees.
- The patient is asked to maintain this position actively as the examiner releases the wrist while supporting the elbow, which is mainly a function of the infraspinatus
What does a positive Drop Sign mean?
The Drop Sign is positive when:
- Weakness in maintaining the position of the arm , with or without pain, or sudden dropping of the arm suggests a rotator cuff lesion, most often this is due to a defect in the supraspinatus muscle
Sensitivity & Specificity
- Sensitivity: 73 %
- Specificity: 98 %
- A positive drop arm test may also have neurologic causes, such as damage to the subscapular nerve, so the patient must be thoroughly examined from a neurologic standpoint.
- In lesions of the supraspinatus muscle as a result of chronic degenerative processes, the drop arm test may be falsely negative due to muscular compensation, especially by the deltoid muscle.
- Campbel's Operative Orthopaedics 13th Book
- Clinical Tests for the Musculoskeletal 3rd Ed. Book
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