Abstract: Devices, systems, and methods for characterizing a condition of spinal deformities are contemplated. Mobile devices that incorporate inclinometers or accelerometers are held securely in a supporting structure. Supporting structures can include features that secure the mobile device in an upper portion and a lower portion that includes at least one roller, and a centrally placed notch dimensioned to permit the assembled device to span the width of a typical human spinal column. The roller includes an encoder that provides a measure of distance travelled as the device rolls. The support device can include additional features, such as additional sensors that are accessible by the mobile device, a centrally placed guide that can be used to keep the assembled device in alignment during use, and supplementary battery power for the mobile device.