Document Detail


Effects of posterior distraction forces on anterior column intradiscal pressure in the dual growing rod technique.
MedLine Citation:
PMID:  25270017     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
BACKGROUND: Little evidence is available addressing biomechanical properties of posterior distraction forces and their effects on anterior spinal column in the growing rod technique. The question is often asked if posterior distraction forces may be kyphogenic. The goal of this study is to determine whether posterior distraction forces transmitted anteriorly through different foundation constructs (i.e., screws vs. hooks) affect intradiscal pressure.
METHODS: Six skeletally immature porcine spines were harvested leaving soft tissues and rib heads intact. Pedicle screws served as the lower foundation on a L3-L4 motion segment while pedicle screws and laminar hooks were randomly used at T3-T4 levels. Proximal constructs (hook vs. screw) were switched after initial distraction testing. The dual rod distractor was instrumented with strain gauges and calibrated using a custom force transducer. During distraction, intradiscal pressures immediately inferior to the superior foundation and the level equidistant between foundations were measured using needle pressure transducers. Maximum distraction force and maximum anterior disc pressure change were compared between hook and pedicle screw anchors using one-way ANOVA (p < 0.05).
RESULTS: Upper foundations with pedicle screws had significantly greater distraction forces (416 ± 101 N) than those with upper level hooks (349 ± 100 N). There were no significant differences in disc pressures between levels or between upper foundation constructs. Disc pressures adjacent to the upper foundation demonstrated greater reduction (disc expansion) than the level equidistant within the construct. Pedicle screw constructs demonstrated greater endplate separation (distraction) compared to hook constructs.
CONCLUSIONS: Posterior distraction forces result in anterior disc separation (distraction) and are distributed across multiple levels rather than delivered to the disc immediately adjacent to a foundation. Constructs with upper foundation hooks had lower distraction forces possibly due to hook motion during distraction. The load distribution at multiple levels may assist with curve control and may affect vertebral growth. The distraction forces may not be kyphogenic as is commonly believed.
Authors:
Andrew Mahar; Nima Kabirian; Behrooz A Akbarnia; Michael Flippin; Tucker Tomlinson; Patricia Kostial; Ramin Bagheri
Related Documents :
1185447 - Congenital diaphragmatic hernia in lambs: hemodynamic and ventilatory changes with brea...
1172927 - Effects of long-term exposures to 100% oxygen at selected simulated altitudes on the pu...
3565587 - Myocardial blood flow and vo2 in conscious lambs with an aortopulmonary shunt.
9444607 - Mechanisms of acute respiratory distress syndrome: role of surfactant changes and mecha...
17778897 - Thermal contrast in the atmosphere of venus: initial appraisal from pioneer venus probe...
3351587 - Intracranial pressure and outcome in adult encephalitis.
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2014-10-1
Journal Detail:
Title:  Journal of orthopaedic science : official journal of the Japanese Orthopaedic Association     Volume:  -     ISSN:  1436-2023     ISO Abbreviation:  J Orthop Sci     Publication Date:  2014 Oct 
Date Detail:
Created Date:  2014-10-1     Completed Date:  -     Revised Date:  2014-10-2    
Medline Journal Info:
Nlm Unique ID:  9604934     Medline TA:  J Orthop Sci     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


Previous Document:  Biomechanical comparison of the strength of adhesion of polymethylmethacrylate cement to zirconia ce...
Next Document:  The programmed cell death 1 gene polymorphisms (PD 1.3 G/A, PD 1.5 C/T and PD 1.9 C/T) and susceptib...