The 3-level biological model of DISH: Post-publication reflections

The 3-level biological model of DISH: Post-publication reflections (v. 9) DISCLAIMER This document presents a conceptual synthesis of observations derived from investigations into the clinical heterogeneity of Diffuse Idiopathic Skeletal Hyperostosis (DISH) within the Camargo Cohort. What began as an attempt to understand why some individuals developed unusually rapid ossification gradually led to broader questions regarding susceptibility, biological activation, and divergent outcomes. Over time, these questions gave rise to three independent studies, each addressing a different aspect of disease heterogeneity. Yet, with each study, the landscape appeared to grow increasingly complex—new constructs, trajectories, and biological layers emerged, raising the concern that the overall picture might be becoming more difficult to interpret. However, when the final landscape was viewed as a whole, a different impression took shape. Beneath the apparent complexity lay a relatively simple underlying organization. In this sense, complexity became the pathway to simplicity. This document is neither a research article nor an extension of the studies from which it originated. It introduces no new data and does not seek to provide definitive explanations. Instead, its objective is to offer an integrative analysis of the three studies that form the architecture of the three-level model, exploring whether findings related to susceptibility, biological activation, and structural trajectories can be interpreted within a common organizational framework. The concepts discussed throughout this document—including the proposed model, the FOSSI constructs, the DAI-5 activation index, and the trajectory framework—should be regarded as working hypotheses requiring independent validation and further refinement. The reflections presented here are offered as a possible interpretation of existing observations and as a contribution to the ongoing discussion regarding the biological organization and heterogeneity of DISH.

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