One embodiment of a hollow spinal spacer includes a curved anterior wall having opposite ends, a posterior wall having opposite ends, two lateral walls, each integrally connected between the opposite ends of the anterior and posterior walls to define a chamber. In this architecture, one or more lookup tables begin processing a digital signal prior to the most significant bit of the digital signal stabilizes. The formulations further comprise a cis-diol such as sorbitol that interferes with the cross-linking of galactomannan and borate. When a critical threshold is exceeded, an alarm indicator is triggered on the box.