Abstract: The invention relates to an orthopedic device for supporting a lower back of a user, wherein the orthopedic device comprises at least one mechanical energy store (6), a pelvic element (2), an upper body element (48) and an upper leg element (4), wherein the mechanical energy store (6) can be charged and discharged by swivelling the upper leg element (4) relative to the upper body element (48), wherein the upper body element (48) is arranged on the pelvic element (2) by means of two rail elements (14), wherein the rail elements (14) are each arranged with a first end on the pelvic element (2) such that they can swivelled about at least a first swivel axis (18) and with a second end (20) opposite the first end (16) on the upper body element (48) such that they can be swivelled about at least a second swivel axis (22).