Biomechanical study of unilateral pedicle screw combined with contralateral translaminar facet screw in transforaminal lumbar interbody fusion. Issue 7 (August 2015)

• Record Type: Journal Article
• Authors: Luo, Beier; Yan, Ming; Huang, Jinghui; Duan, Wei; Huang, Zhiping; Chen, Jianting; Luo, Zhuojing; Zhu, Qingan; Li, Ming
• Is Part Of: Clinical biomechanics. Volume 30:Issue 7(2015)
• Page Start: 657
• Page End: 661
• Publication Date: 2015-08
• Subjects: Biomechanics -- Periodicals; Osteopathic medicine -- Periodicals; Biomechanics -- Periodicals; Osteopathic Medicine -- Periodicals; 612.76
• DOI: 10.1016/j.clinbiomech.2015.05.009
• Languages: English
• ISSNs: 0268-0033

Abstract

<abstract abstract-type="author" id="ab0015"> <title id="st0045">Abstract</title> <sec> <title id="st0050">Background</title> <p id="sp0060">The biomechanical stability of unilateral pedicle screw (UPS) combined with contralateral translaminar facet screw (TLFS), especially long-term stability, still needs to be compared to traditional UPS or bilateral pedicle screws (BPSs) in details.</p> </sec> <sec> <title id="st0055">Methods</title> <p id="sp0065">Twenty-four porcine spines (L2–L5) were tested for flexibility with pure moments of 5 Nm under intact status and transforaminal lumbar interbody fusion status using UPS + TLFS, UPS or BPS at L3–L4. After short-term (3 cycles) and long-term cyclic loading (18, 000 cycles), the range of motion was obtained and analyzed for single-level constructs in flexion/extension, lateral bending and axial rotation modes. In addition, the relative displacement of contralateral articular processes was recorded in a real time fashion.</p> </sec> <sec> <title id="st0060">Findings</title> <p id="sp0070">The range of motion was significantly reduced in all instrumented constructs. In all movement directions, UPS + TLFS achieved similar range of motion to BPS after short and long-term loading, which were significantly lower than that in UPS. A significantly larger displacement of contralateral articular process was recorded in UPS than UPS + TLFS and BPS during extension/flexion, lateral bending and axial rotation, suggesting its compromised stability.</p> </sec> <sec> <title id="st0065">Interpretation</title> <p id="sp0075">The hybrid construct of UPS + TLFS showed instant and long-term equivalent biomechanical ability to that of traditional BPS, making it an alternative option to BPS that could be less invasive while maintains a stable and effective instrumentation.</p> </sec> </abstract>