A Biomechanical Comparison of Two Intramedullary Implants for Subtrochanteric Fracture in Two Healing Stages: A Finite Element Analysis

Table 3

Comparison of peak stresses of the femoral head between two implants (MPa).

Healing stage	Implant	Principal stress		von Mises stress
		Tensile	Compressive
Soft callus	PFNA-II	40.4	−42.2	45.2
	A2FN	30.5	−33.1	46.3
Hard callus	PFNA-II	39.2	−45.2	46.3
	A2FN	28.2	−39.1	47.3