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Subacromial injection of local anaesthetic does not affect strength in healthy shoulders

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SHOULDER & ELBOW

Subacromial injection of local anaesthetic does not affect strength in healthy shoulders .

This report has been verified by one or more authors of the original publication.

Does Subacromial Injection of a Local Anesthetic Influence Strength in Healthy Shoulders? A Double-Blinded, Placebo-Controlled Study

J Bone Joint Surg Am. 2012 Oct 3;94(19):1751-5. doi: 10.2106/JBJS.K.00855

Contributing Authors

M Farshad M Jundt-Ecker R Sutter M Schubert C Gerber

10 healthy male volunteers (20 shoulders) were randomized to receive a subacromial injection of lidocaine in one shoulder and an injection of 0.9% saline in the contralateral shoulder, to determine if the injection of a local anaesthetic could effect shoulder strength and possibly lead to a falsified clinical assessments of rotator cuff tears. 45 minutes after the injection, there was no significant difference between the two injections for pain. There was a significant decrease in arm elevation strength during the Whipple test for the placebo shoulders but not for the lidocaine shoulders. The two groups also did not differ significantly for abduction strength, external rotation strength, distal latency, the compound motor action potential amplitude, and the motor unit number estimate.

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