L K Chen1, K H Li2. 1. Department of Orthopaedics, Second People's Hospital of Hunan Province, Changsha 410007, China. 2. Department of Orthopaedics, Xiangya Hospital of Central South University, Changsha 410008, China. lkkhcn@yeah.net.
Abstract
PURPOSE: The aim of this study was to investigate the effects of C5/6 cervical artificial disc replacement (CADR), discectomy and intervertebral fusion on adjacent inferior (C6/7) intervertebral space stress, and provide a basis for application of CADR. METHODS: Eleven fresh-frozen multisegmental (C3-T1) cervical spine specimens from healthy adults were studied. For analysis of stress on the adjacent inferior (C5/6) segment, they were divided into intact group, discectomy group, CADR group and interbody fusion group. The axial load (25-150 N) was exerted on each group. The changes of the adjacent inferior (C6/7) intervertebral space stress were observed. RESULTS: The adjacent inferior intervertebral space stress in the CADR group was near to that of the intact group, without significant difference (p > 0.05). The stress in the discectomy group was significantly higher than in the intact group, and lower than in the interbody fusion group (p < 0.05 and p < 0.01, respectively). The stress in the interbody fusion group was significantly higher than in the intact and CADR groups, respectively (p < 0.01).
PURPOSE: The aim of this study was to investigate the effects of C5/6 cervical artificial disc replacement (CADR), discectomy and intervertebral fusion on adjacent inferior (C6/7) intervertebral space stress, and provide a basis for application of CADR. METHODS: Eleven fresh-frozen multisegmental (C3-T1) cervical spine specimens from healthy adults were studied. For analysis of stress on the adjacent inferior (C5/6) segment, they were divided into intact group, discectomy group, CADR group and interbody fusion group. The axial load (25-150 N) was exerted on each group. The changes of the adjacent inferior (C6/7) intervertebral space stress were observed. RESULTS: The adjacent inferior intervertebral space stress in the CADR group was near to that of the intact group, without significant difference (p > 0.05). The stress in the discectomy group was significantly higher than in the intact group, and lower than in the interbody fusion group (p < 0.05 and p < 0.01, respectively). The stress in the interbody fusion group was significantly higher than in the intact and CADR groups, respectively (p < 0.01).
Authors: Bryan W Cunningham; Jeffrey D Gordon; Anton E Dmitriev; Nianbin Hu; Paul C McAfee Journal: Spine (Phila Pa 1976) Date: 2003-10-15 Impact factor: 3.468
Authors: T K Taylor; J Melrose; D Burkhardt; P Ghosh; L E Claes; A Kettler; H J Wilke Journal: Spine (Phila Pa 1976) Date: 2000-12-01 Impact factor: 3.468