Computer-implemented systems and methods for analyzing costs associated with a cost flow model having components of relationships and entities. To that end, some of the embodiments of the invention are directed to plate systems for aligning and maintaining adjacent cervical vertebrae in a selected spatial relationship during spinal fusion of such vertebrae. A first logging event corresponding to the communication request is created. When a rebuild start request is generated by the rebuild processor, the rebuild controller controls the start and stop of the rebuild process by referring to the management table.