Disclosed is a positionable rotary backstop interbody fusion cage, comprising a front segment (1) and a rear segment (2). A fusion skylight (3) is provided both in the front segment (1) and in the rear segment (2)； a rotating shaft (5) with a gear (4) is provided at the front end of the rear segment (2), the rear end of the front segment (1) is connected with the rear segment (2) via the rotating shaft (5). A rotation stop device is provided in the rear segment (2) and comprises a pair of rotation stop tongs (6) and a centre axis nut (7), the front end of the centre axis nut (7) is provided in the rotation stop tongs (6). A backstop pin (10) is provided at the rear end of the rear segment (2)； an adjusting nut (11) is sleeved at the rear end of the centre axis nut (7) and used for adjusting the status of the backstop pin (10). The rotation stop device coordinates with the rotating shaft (5) such that the surgical device in an implant surgery can be fixed after rotating undirectionally for a certain angle； and the backstop pin (10) coordinates with the adjusting nut (11) to achieve the purpose of preventing the fusion cage from slipping and guaranteeing the fusion efficiency. The opening of the rotation stop tongs (6) intersects, during movement, with the fusion skylight (3) to squeeze the interior bones towards the outside of the fusion device, thereby guaranteeing the contact of the bones and the spine to improve fusion.La présente invention concerne une cage de fusion intersomatique d'arrêt arrière rotative pouvant être positionnée, comprenant un segment avant (1) et un segment arrière (2). Une ouverture du type lanterneau de fusion (3) est disposé à la fois dans le segment avant (1) et dans le segment arrière (2) ； une tige de rotation (5) dotée d'un engrenage (4) est disposée à l'extrémité avant du segment arrière (2), l'extrémité arrière du segment avant (1) étant reliée au segment arrière (2) par l'intermédiaire de la tige de rotation (5). Un dispositif d'arrê
