A biceps tendon rupture can cause the "Popeye deformity," which is a bulging of the muscle distally and flattening proximally. It is most often the long head of the biceps tendon at the proximal insertion that ruptures.
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Alessandro F. - March 28, 2021 3:53 PM
Emerg/Sports Med MD here.
Important to remember that proximal biceps tendon ruptures are usually treated non-operatively (especially in the elderly) and typically only surgically repaired for cosmetic reasons in younger adults.
Complete DISTAL biceps tendon ruptures are different and should be fixed urgently (<4 weeks). The Hook Test is a good physical exam maneuver to assess for the distal tendons integrity!