Table 3.

Local/far-field 95th percentile strain concentration factors at the donor-recipient interface

Model family	Pooled analysis set	n	$K_{95}$, compressive strain Mean ± SD	$K_{95}$, maximum shear strain Mean ± SD
Homogeneous linear elastic	99 configurations × 2 sides	198	3.71 ± 2.04	6.03 ± 3.79
FGM	9 ratios × 2 sides	18	3.51 ± 2.17	5.69 ± 4.03

Values are mean ± one standard deviation across side-specific model regions. The homogeneous sample comprises 99 configurations × 2 sides (n = 198), and the FGM sample comprises nine ratios × 2 sides (n = 18). $K_{95}$ was calculated as the local-interface-ROI 95th percentile strain divided by the same-side far-field median strain. The local interface ROI was defined as $0<\left|x,-,8\right|\le 0.25$ mm from the donor-recipient interface, and the far-field band was defined as $0.75\le \left|x,-,8\right|\le 1.00$ mm. A value greater than 1 indicates local interface strain amplification relative to each model’s own far-field strain environment