Eccentric Loading & Asymmetric Callus Differentiation (2D Cross-Section)

This 2D companion to the 3D interfragmentary-strain simulator looks straight down the bone's axis at the fracture plane itself, discretized into 24 independent tissue sectors around the circumference. Rather than one lumped stiffness number, each sector solves a real statically-indeterminate beam-bending equilibrium (force balance plus moment balance) to find its own local gap-opening strain, so an off-axis "eccentric" load — the kind produced by muscle pull or uneven weight-bearing — is modeled as a genuine bending moment rather than ignored. The result is a callus ring that can differentiate asymmetrically: the compression side crosses into the bone-forming strain window and bridges quickly while the tension side, carrying amplified strain, stalls as fibrous tissue or drifts toward nonunion — a real and clinically documented failure mode that a single-axis model cannot show. Adjust fixation method, axial load, eccentricity and gap size to see how each reshapes the strain distribution around the ring.