| CPC A61B 34/20 (2016.02) [A61B 6/505 (2013.01); A61B 2034/2055 (2016.02)] | 11 Claims | 

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               1. A system for registering at least a portion of a patient's spinal curvature and/or flexibility, comprising: 
            an acquisition system for acquiring data using a continuous or discrete 3D-tracked acquisition along a surface of a spine of the patient; 
                non-transient computer readable media for storing at least a portion of the acquired data; 
                one or more computer processors configured to analyze at least a portion of the acquired data and generating a quantitative assessment of the patient's spinal biomechanical qualities, 
                wherein the acquisition system includes a fiducial marker device with a registration interface and bone fixation features, wherein the registration interface includes a tapered cylindrical protrusion with a back surface and a keyed front surface used for mating with a 3-D tracked probe, wherein the registration interface is configured to be received inside a tip of the 3-D tracked probe during registration, 
                wherein the 3-D tracked probe registers continuous points along a surface of the spine of the patient, 
                wherein the 3-D tracked probe includes a depressible trigger button to enable an active state for registering points on the surface of the spine. 
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