| Thermomechanical effects of spine surgery rods composed of different metals and alloys. | |
| | |
MedLine Citation:
|
PMID: 20739915 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
|
STUDY DESIGN.: A basic science study monitoring changes in the curvature of hand contoured commercially pure titanium (CPTi), titanium-aluminum-vanadium alloy (Ti-6Al-4V), and stainless steel (SS) rods maintained at different temperature conditions. OBJECTIVE.: To quantify changes in rod-shape at temperatures representative of those used in clinical practice. SUMMARY OF BACKGROUND DATA.: The shape of implanted rods can be displaced due to thermo-mechanical properties of the materials. Warmer temperatures likely initiate this effect. A study of shape loss characteristics of various rod implants may help eliminate undesirable outcomes caused by shape displacement. METHODS.: Three different types of rods (CPTi, SS, and Ti-6Al-4V) were hand contoured and then maintained in one of following temperature conditions for 35 days: (1) room temperature (20°C-25°C) without autoclaving before contouring; (2) preliminary autoclaving (1, 5, 10, 20 cycles) at 135.0°C ± 2°C before contouring followed by body temperature (37.2°C ± 2°C). Each rod was 5 mm in diameter and 200 mm long. The rods were mounted over graph paper in fixed positions and photographed to measure displacement of the tip as a function of the curvature. RESULTS.: Statistically significant shape loss of the rods manufactured from all the tested materials was found. The hand contoured CPTi rods displayed considerably higher loss of curvature over time than Ti-6Al-4V and SS rods at all tested temperature conditions. Preliminary autoclaving at 135°C before contouring tended to amplify this effect, in particular 1 cycle of autoclaving. If the number of preliminary autoclaving cycles was higher (5-10), a tendency of decrease of shape loss effect was observed in Ti-6Al-4V and CPTi rods. CONCLUSION.: The shape of the hand contoured CPTi rods was the least stable of the rods across all applied temperature conditions. The SS and Ti-6Al-4V rods were more stable than CPTi rods. Autoclaving before handcontouring tended to increase rods' shape loss. |
| | |
Authors:
|
Andriy Noshchenko; Vikas V Patel; Todd Baldini; Lu Yun; Emily M Lindley; Evalina L Burger |
Related Documents
:
|
17638115 - Differential distribution of chlorophyll biosynthetic intermediates in stroma, envelope... 7525575 - Rupture of the mitochondrial outer membrane impairs porin assembly. 9159515 - Tonb protein appears to transduce energy by shuttling between the cytoplasmic membrane ... 17602665 - Interphotoreceptor retinoid-binding protein is the physiologically relevant carrier tha... 131035 - Inhibition by triphenyltin chloride of a tightly-bound membrane component involved in p... 2306095 - Equilibrium temperature in a clump of bacteria heated in fluid. |
Publication Detail:
|
Type: Journal Article |
Journal Detail:
|
Title: Spine Volume: 36 ISSN: 1528-1159 ISO Abbreviation: Spine Publication Date: 2011 May |
Date Detail:
|
Created Date: 2011-05-04 Completed Date: - Revised Date: - |
Medline Journal Info:
|
Nlm Unique ID: 7610646 Medline TA: Spine (Phila Pa 1976) Country: United States |
Other Details:
|
Languages: eng Pagination: 870-8 Citation Subset: IM |
Affiliation:
|
*The Spine Center at the University of Colorado, Denver, CO †Bioengineering Division, Department of Orthopaedics, University of Colorado, Denver, CO. |
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: Laminectomy in Patients With Achondroplasia: The Impact of Time to Surgery on Long-term Function.
Next Document: Morbidity and mortality in the surgical treatment of six hundred five pediatric patients with isthmi...