Optimum Configuration of Cannulated Compression Screws for the Fixation of Unstable Femoral Neck Fractures: Finite Element Analysis Evaluation

Table 1

Distance from the surface of the femoral head to the tip of each screw in different models.

	Triangle			Inverted triangle			Anterior triangle			Posterior triangle			Vertical model
	S	IP	IA	SP	SA	I	S	A	I	S	P	I	S	M	I
Distance(mm)	9.8	9.2	9.6	10.7	9.6	10.4	8.4	10.7	9.4	8.6	11.2	9.5	8.2	11.6	10.7

Abbreviation: S, superior; IP, inferoposterior; IA, inferoanterior; SP, superoposterior; SA, superoanterior; I, inferior; A, anterior; P, posterior; M, middle.