The present invention relates to a therapeutic positioning device for the treatment of deviations of the spine in hypotonic patients, in particular hypotonic scoliosis of neurological or neuromuscular origin, of the type comprising a seat (1) on which is mounted a backrest (3 ) which comprises a frame, said seat (3) comprising means for wedging the pelvis (11, 13, 15) of a patient, said frame comprising first means (72) for attaching the torso of a patient. According to the invention, typically, said frame comprises on its front face which is oriented towards said seat: - a straightening corset (31) integral with said frame and also extending above said seat (1), along the depth of said seat (1), said corset (31) comprising lateral windows, and - a lateral support (311) and a lateral support (313), which extend according to the depth of said seat (1) and the height of said backrest (3) and which are mounted on said frame at different heights through said side windows provided in said corset (31), said support (311) and said counter-support (313) being mounted adjustable and lockable in position by translation along the width of said backrest (3) and optionally according to the depth of said seat (1) and the height of said backrest (3) and said first attachment means (72) of the patient's torso connect said support (311 ) and said counter-support (313) . La présente invention concerne un dispositif thérapeutique de positionnement pour le traitement des déviations de la colonne vertébrales chez les patients hypotoniques, notamment des scolioses hypotoniques d'origine neurologique ou neuromusculaire, du type comportant une assise (1) sur laquelle est monté un dossier (3) qui comprend une armature, ladite assise (3) comportant des moyens de calage du bassin (11, 13, 15) d'un patient, ladite armature comportant des premiers moyens d'attache (72) du torse d'un patient. Selon l'invention, de manière caractéristique, ladite armature comprend sur sa face avant qui
