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Tuyển tập các báo cáo nghiên cứu về hóa học được đăng trên tạp chí sinh học quốc tế đề tài : Evaluation of unilateral cage-instrumented fixation for lumbar spine | Chang et al. Journal of Orthopaedic Surgery and Research 2010 5 86 http www.josr-online.eom content 5 1 86 JOURNAL OF ORTHOPAEDIC SURGERY AND RESEARCH RESEARCH ARTICLE Open Access Evaluation of unilateral cage-instrumented fixation for lumbar spine Ti-Sheng Chang1 2 Jia-Hao Chang3 Chien-Shiung Wang1 Hung-Yi Chen1 Ching-Wei Cheng1 Abstract Background To investigate how unilateral cage-instrumented posterior lumbar interbody fusion PLIF affects the three-dimensional flexibility in degenerative disc disease by comparing the biomechanical characteristics of unilateral and bilateral cage-instrumented PLIF. Methods Twelve motion segments in sheep lumbar spine specimens were tested for flexion extension axial rotation and lateral bending by nondestructive flexibility test method using a nonconstrained testing apparatus. The specimens were divided into two equal groups. Group 1 received unilateral procedures while group 2 received bilateral procedures. Laminectomy facectomy discectomy cage insertion and transpedicle screw insertion were performed sequentially after testing the intact status. Changes in range of motion ROM and neutral zone NZ were compared between unilateral and bilateral cage-instrumented PLIF. Results Both ROM and NZ unilateral cage-instrumented PLIF and bilateral cage-instrumented PLIF transpedicle screw insertion procedure did not revealed a significant difference between flexion-extension lateral bending and axial rotation direction except the ROM in the axial rotation. The bilateral group s ROM -1.7 0. 8 of axial rotation was decreased significantly after transpedicle screw insertion procedure in comparison with the unilateral group -0.2 0.1 . In the unilateral cage-instrumented PLIF group the transpedicle screw insertion procedure did not demonstrate a significant difference between right and left side in the lateral bending and axial rotation direction. Conclusions Based on the results of this study unilateral cage-instrumented PLIF and bilateral .
