An embodiment of the invention is a shoulder dislocation acute-phase immobilization orthosis for supporting, in treatment for a shoulder dislocation, an arm in a prescribed position while the elbow is bent at a right angle in an arm hanging position. The orthosis comprises: a support frame (1) integrally formed of a lightweight hard thick-plated material, with a width approximately greater than that of the forearm, comprising: a curved portion (3) which follows the shape of the abdominal part of a body and an arm supporting side face (5) of approximately the forearm length, which is integrally extended forward from one end of the curved portion (3) via a bent portion (4) and is bent at an appointed angle; an arm supporting member(s) (6) for immobilizing the forearm, provided on the arm supporting side face (5) of the support frame (1); and a wrap-around belt (2) made of a flexible material having a width identical to that of the support frame 1, provided with a surface fastener (8) for fitting the support frame (1) to the trunk part of a body.
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