Finite element analysis of different configurations of fully threaded cannulated screw in the treatment of unstable femoral neck fractures

Table 3 Maximum stress (Mpa) on each screw of different models under increasing loads

	Triangle			Inverted Triangle			Triangle with anterior single screw			Triangle with posterior single screw			Vertical
	S*	IP	IA	SP	SA	I*	S	A*	I	S	P*	I	S	M*	I
500 N	63	202	222	146	228	100	147	75	293	146	43	455	138	54	262
1000 N	128	427	453	301	462	194	302	153	579	299	91	940	283	109	524
1500 N	195	676	692	464	703	284	466	231	854	460	142	1452	435	165	780
2100 N	263	945	941	635	950	369	637	311	1115	629	195	1990	593	223	1028

S superior, IP inferoposterior, IA inferoanterior, SP superoposterior, SA superoanterior, I inferior, A anterior, P posterior, M middle
*Partially threaded cannulated screw

ISSN: 1749-799X