Poisson-Press Theory: A Macromechanical Framework for Connective Tissue Morphogenesis

Connective tissue architecture has traditionally been explained through a fibroblast‑centric paradigm, in which local cells are assumed to generate global structure. This view contains a fundamental spatial paradox: individual cells cannot perceive or plan macroscopic tissue axes. The Poisson‑Press Theory resolves this paradox by proposing that anomalous Poisson compression and poroelastic syneresis—not cellular intention—constitute the primary drivers of planarization, alignment, and lamination in hydrated collagen networks. Under developmental or functional loading, these macromechanical processes collapse porosity, expel interstitial fluid, and force collagen sheets into coherent planar laminae, establishing the geometric template that biology subsequently consolidates through fibroblast activation and collagen crosslinking (“biological welding”).

By contrasting shear‑driven lamination in the thoracolumbar fascia with pure poroelastic collapse in the retroperitoneal fascia, the theory shows how diverse fascial architectures emerge from a single physical law operating under different boundary conditions. The framework further extends to adult life, reframing occupational, athletic, and pathological remodeling as continuous adaptive mechanomorphogenesis driven by persistent Poisson‑Press fields. This work provides a unified macromechanical explanation for both developmental morphogenesis and adult fascial remodeling, restoring the correct causal hierarchy: physics establishes the template, biology welds it into permanence.