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Proximal Rupture of the Biceps Brachii with Slingshot Displacement into the Forearm. A Case Report*
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Investigation performed at the Departments of Orthopaedic Surgery and Radiology, The Hospital for Special Surgery, New York City
J Bone Joint Surg Am, 1996 Nov 01;78(11):1749-52
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Disruption of the biceps brachii is unusual in persons who are less than fifty years old7,12,18,20-23,28. Rupture is generally secondary to either tendinopathy (distal) or tenosynovitis secondary to impingement (proximal), and it occurs almost exclusively in adults6,8,12,15,20. Proximal transection of the muscle belly has been described in military paratroopers10 and as a result of a direct blow14, although we are not aware of any reports identifying displacement of the distal portion of the musculotendinous unit. We present the case of a patient who had a traction injury to the proximal end of the biceps, which occurred with such force that the elastic recoil resulted in displacement of the musculotendinous unit around its intact distal insertion and into the forearm. To our knowledge, this is the first report of such an injury in any age-group.
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