Abstract: Described herein are devices, systems and methods for minimally-invasive treating spinal conditions. In one aspect, disclosed is an intervertebral fixation device having a housing sized to be positioned between adjacent inferior and superior vertebrae. The housing includes an internal volume defined by an inferior coupling element, a superior coupling element, and first and second sidewalls. The device includes at least one flexible element coupled to an internal surface of at least one of the inferior or superior coupling elements. The at least one flexible element projects into the internal volume of the housing when in a first configuration. The device includes at least one fixation member coupled to the flexible element and sized to extend through a corresponding aperture in the inferior or superior coupling element.