Abstract: The present invention provides articulating expandable devices and insertion tools for deploying the articulating expandable devices. The articulating expandable devices are capable of being inserted into narrow spaces and turning around corners. The articulating expandable devices are capable of increasing in height and width when expanded from a closed configuration to an open configuration to occupy a larger volume and to present a larger surface area. The articulating expandable devices are lockable and are capable of rigidly occupying a space after expansion. In some embodiments, the articulating expandable devices are useful as interbody devices for spinal fusions.