Electromyographic analysis of physical examination tests for type II superior labrum anterior-posterior lesions

Abstract

Physical examination tests that place tension on the long head of the biceps may best reproduce symptoms in patients with type II superior labrum anterior-posterior (SLAP) lesions. The objective of this study is to compare the normalized electromyographic signal of the long head of the biceps for SLAP lesion physical examination tests. The active compression test, anterior-superior SLAP test, biceps load test II, biceps tension test, and pain provocation test were performed on 13 subjects while biceps electromyographic data were recorded. The active compression test and biceps tension test had significantly higher electromyographic signals than the other tests. We found no significant differences when comparing forearm supination and pronation within individual tests. Because the active compression and biceps tension tests maximize muscle activation on the long head of the biceps, they may be the best physical examination tests by which to identify type II SLAP lesions.