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Shoulder surgeons performing tenodesis note a great variability in morphology of the proximal biceps. The hourglass biceps test measures the integrity of the intra-articular biceps tendon. The hourglass maneuver (HM) is positive when there is a passive flexion deficit compared to the contralateral shoulder in a relaxed patient in the supine position. Preoperative HM is correlated with an increased width of the biceps portion resected during tenodesis. This prospective study evaluated all patients (N = 58) who underwent biceps tenodesis