The effect of the necrotic area on the biomechanics of the femoral head - a finite element study

Table 3 The displacement increment and von Mises stress decrement of the lateral pillar contact area in the models

	M (⁻x ± s)	C(⁻x ± s)	L1(⁻x ± s)	L2(⁻x ± s)	L3(⁻x ± s)	P value
Displacement increment (μm)	1.93 ± 0.15	5.74 ± 0.92	5.84 ± 1.42	14.50 ± 3.00	16.43 ± 3.05	< 0.001
Von Mises stress decrement (MPa)	0.52 ± 0.30	0.55 ± 0.12	0.67 ± 0.33	4.17 ± 0.59	4.19 ± 0.60	< 0.001

Type M: the necrosis involved the medial pillar. Type C: the necrosis involved both medial and central pillars. Type L1: the necrosis involved the three pillars but the partial lateral pillar was preserved. Type L2: the necrosis involved the whole lateral pillar and partial central pillar. Type L3: the necrosis involved the three pillars including the cortical bone and marrow

ISSN: 1471-2474