Table 3. Distribution of the overall maximum stress (MPa) for the five defect volumes in the screw-rod system.

Operating conditions	Normal	No defect + screw rod	1/5 defect + screw rod	2/5 defect + screw rod	3/5 defect + screw rod	4/5 defect + rod	5/5 defects + rod
Vertical load	14.81	11.6197	12.0869	12.1244	12.2679	12.9497	13.0215
Forward flexion	47.6097	49.5652	49.6335	49.6614	49.6855	49.8033	50.4557
Extension	46.7774	49.3582	49.4302	49.4559	49.4799	49.6072	50.275
Right-side flexion	53.341	66.8137	66.8881	66.8911	66.9698	67.1206	67.6255
Left-side flexion	53.371	66.7242	66.8069	66.8059	66.8816	67.0438	67.571
Right rotation	14.2186	77.9848	78.0322	78.3024	78.6208	79.0391	81.0592
Left rotation	12.6502	77.5221	77.5269	77.5897	77.6052	77.692	78.1414