| The effect of posterior distraction on vertebral growth in immature pigs: an experimental simulation of growing rod technique. | |
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MedLine Citation:
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PMID: 20195208 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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STUDY DESIGN: Experimental study. OBJECTIVE: The aim of this study is to evaluate the vertebral body growth under distraction forces in immature pigs treated with growing rod (GR) technique. SUMMARY OF BACKGROUND DATA: Distraction forces applied on growth plate of appendicular skeleton stimulate longitudinal growth. However, the effect of distraction forces on axial skeletal growth has not been fully investigated yet. METHODS: Twelve 10-week-old domestic pigs were used in this experimental model to simulate GR technique. Four of them were lost during postoperative period because of deep wound infection. Cranially T12-L1 and caudally L4-L5 vertebrae were instrumented by pedicle screws bilaterally, while L2 and L3 were skipped. Distraction between pedicle screws was applied at index surgery. The rods were then lengthened twice in a month interval. All subjects were evaluated with anteroposterior and lateral spinal radiograph before surgery, after surgery, and at the final follow-up. The vertebral body heights of distracted segments (HD = L2 and L3) and control segments (HC = T9, T10 and T11) were measured. Average vertebral body heights and the increase percentage in the vertebral body heights were compared among control segments and distracted segments. RESULTS: The preoperative vertebral body height was similar in 2 groups (preHC: 10.81 mm, n = 19, preHD: 11.27 mm, n = 16, P > 0.05). At the final follow-up, the average vertebral body height in distraction group was significantly higher than the control group (postHC: 17.03 mm, postHD: 18.58 mm, P < 0.05). The increase percentage in vertebral body height was higher in distracted segments, but there was no statistically significant difference between the 2 groups. CONCLUSION: The vertebral growth continues during GR instrumentation. Distraction forces might stimulate also apophyseal growth of axial skeleton. |
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Authors:
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Güney Yilmaz; Gazi Huri; Gökhan Demirkran; Kenan Dağloğlu; Cenk Ozkan; Ahmet Alanay; Emre Acaroglu; Muharrem Yazici |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Spine Volume: 35 ISSN: 1528-1159 ISO Abbreviation: Spine Publication Date: 2010 Apr |
Date Detail:
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Created Date: 2010-04-14 Completed Date: 2010-07-09 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 7610646 Medline TA: Spine (Phila Pa 1976) Country: United States |
Other Details:
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Languages: eng Pagination: 730-3 Citation Subset: IM |
Affiliation:
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Department of Orthopaedics and Traumatology, Hacettepe University, Ankara, Turkey. |
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| MeSH Terms | |
Descriptor/Qualifier:
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Animals Bone Screws Disease Models, Animal Internal Fixators Lumbar Vertebrae / growth & development, radiography, surgery* Osteogenesis, Distraction / methods* Scoliosis / radiography, surgery Swine Thoracic Vertebrae / growth & development, radiography, surgery* Treatment Outcome |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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