کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
3094539 1581464 2016 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Evaluation of Titanium-Coated Pedicle Screws: In Vivo Porcine Lumbar Spine Model
موضوعات مرتبط
علوم زیستی و بیوفناوری علم عصب شناسی عصب شناسی
پیش نمایش صفحه اول مقاله
Evaluation of Titanium-Coated Pedicle Screws: In Vivo Porcine Lumbar Spine Model
چکیده انگلیسی

ObjectiveMany studies have addressed the problem of loosening pedicle screws in spinal surgery, which is a serious concern. Titanium coating of medical implants (arthroplasty) is common, but few studies involving in vivo spine models have been reported. We evaluated the radiological, mechanical, and histological characteristics of titanium-coated pedicle screws compared with uncoated or hydroxyapatite-coated pedicle screws.MethodsThree different types of pedicle screws, i.e., uncoated, hydroxyapatite-coated, and titanium-coated, were implanted into the lumbar 3-4-5 levels of 9 mature miniature pigs. Radiological evaluation of loosening of pedicle screws was performed. Peak torsional extraction torque was tested in the 42 screws from 7 miniature pigs at 12 weeks postoperatively. The implant–bone interface of the remaining 12 pedicle screws from 2 miniature pigs in each group was assessed by micro-computed tomography and histologic studies.ResultsThe incidence of loosening at 12 weeks postoperatively was not significantly different between the titanium-coated pedicle screw group and the other groups. The titanium-coated pedicle screw group exhibited the greatest mean extraction torsional peak torque at 12 weeks postoperatively (P < 0.05). Quantitative micro-computed tomography data were greatest in the titanium-coated pedicle screw group (P < 0.05). Histologic findings showed osteointegration with densely packed new bone formation at the screw coating–bone interface in the titanium-coated pedicle screw group.ConclusionsFixation strength was greatest in the titanium-coated pedicle screw group. Osteointegration at the interface between the titanium-coated implant and bone produced prominent and firm bonding. The titanium-coated pedicle screw is a promising device for application in spinal surgery.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: World Neurosurgery - Volume 91, July 2016, Pages 163–171
نویسندگان
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