Biomechanical effect of endplate defects on the intermediate vertebral bone in consecutive two-level anterior cervical discectomy and fusion: a finite element analysis

Table 4 Comparison of endplate pressure after two-level ACDF using CP or zero-profile device ZP

FE	Extension				Flexion				Lateral bending				Axial
FE	ZP	IM-ZP	CP	IM-CP	ZP	IM-ZP	CP	IM-CP	ZP	IM-ZP	CP	IM-CP	ZP	IM-ZP	CP	IM-CP
A	28.51	36.54	18.87	19.52	19.18	24.9	18.55	20.27	36.85	39.45	23.27	24.33	40.15	44.71	26.83	27.99
B	38.73	43.79	23.85	25.30	30.61	37.8	20.76	19.74	39.10	48.23	12.03	12.31	37.93	47.82	16.72	17.84
C	31.96	39.51	23.85	25.30	26.96	34.93	20.76	19.74	33.60	40.92	12.03	12.31	43.44	46.30	16.42	17.81
D	37.32	42.77	20.04	21.93	35.53	38.78	19.94	18.4	31.64	37.75	17.08	17.19	37.84	41.04	25.59	26.55

A The inferior endplate of C4, B The superior endplate of C5, C The inferior endplate of C5, D The superior endplate of C6

ISSN: 1471-2474