بررسی نوسازی استخوان در اطراف پیچ اورتوپدی هدفمند و مقایسه با پیچ فلزی با استفاده از روش اجزای محدود

نوع مقاله: مقاله کامل پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد، گروه مکانیک، دانشکده مهندسی، دانشگاه فردوسی فردوسی مشهد

2 دانشیار، گروه مکانیک، دانشکده مهندسی، دانشگاه فردوسی مشهد

3 استادیار، دانشکده مهندسی پزشکی، دانشگاه صنعتی امیرکبیر، تهران گروه مهندسی مکانیک، دانشگاه اتاوا

10.22041/ijbme.2011.13139

چکیده

پیچ‌های اورتوپدی ابزار رایجی برای تثبیت استخوان شکسته محسوب می‌شوند. شل شدن پیچ‌ها در اثر نبودن تنش کافی در استخوان مجاور پیچ و جذب استخوان ناشی از آن، یکی از عوامل موفق نبودن ترمیم شکستگی‌ها است. در این مطالعه، پیچ اورتوپدی هدفمند از ماده تیتانیوم و هیدروکسی اپتایت، Ti-Hap، همراه استخوان‌های اسفنجی و متراکم در نرم‌افزار اجزای محدود، مدلسازی شده است. پارامتر انتقال تنش، STPو پارامتر انتقال چگالی انرژی کرنشی، SEDTPتعریف می‌شود که به ترتیب نسبت تنش و نسبت چگالی انرژی کرنشی را در دندانه‌های پیچ به نقاط مجاور در استخوان بیان می‌کنند. مقادیر کم این پارامترها انتقال ضعیف تنش و چگالی انرژی کرنشی را به استخوان مجاور نشان می‌دهد که نشانه‌ای از پدیده مضر سپر تنش است. نتایج این تحقیق نشان داد که مقدار پارامترهای STPو SEDTP، برای پیچ هدفمند در مقایسه با پیچ فلزی، بیشتر است. بعلاوه با کاهش مدول الاستیسیته جزء فلزی و با افزایش جزء حجمی سرامیک، آثار منفی سپر تنش کاهش می‌یابد. برای پیچی که دارای یک قسمت همگن و یک قسمت هدفمند است؛ هر چه طول قسمت هدفمند بیشتر باشد، پارامترها مقدار بزرگتری را نشان می‌دهند. بنابراین اثر سپر تنشی و مقدار شل‌شدگی پیچ کاهش می‌یابد. همچنین هر چه قسمت هدفمند در موقعیتی نزدیک‌تر به دندانه‌های ابتدایی قرار گیرد، مقدار پارامترهای STPو SEDTP، افزایش می‌یابد. به علاوه نتایج نشان داد با کاهش توان ترکیب توزیعی که نشان‌دهندة نحوه تغییر ترکیب هدفمند از فلز به سرامیک است، مقدار پارامترها افزایش می‌یابد. نتایج این تحقیق با مطالعات بالینی و آزمایشگاهی در دسترس، تطابق خوبی دارد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Analysis of Bone Remodeling around Functionally Graded Orthopedic Screws and Comparison with Metal Screws Using Finite Element Method

نویسندگان [English]

  • Behnoud Haghighi 1
  • Masoud Tahani 2
  • Gholam Reza Rouhi 3
1 M.Sc, Mechanics Group, Faculty of Engineering, Ferdowsi University
2 Associate Professor, Mechanics Group, Faculty of Engineering, Ferdowsi University
3 Assistant Professor , School of Biomedical Engineering , Amirkabir University of Technology Uottawa University, Tehran & Uottawa, Iran & Canada,
چکیده [English]

Orthopedic screws are widely used devices for fixation of bone fractures. Progressive loosening of bone fixation screws, induced by stress shielding and subsequent adaptive bone remodeling, results in bone loss around the screw. A set of two-dimensional finite element models including cortical and cancellous bone with a functionally graded Ti-Hap screw was developed. A dimensionless set of stress-transfer parameters (STP) and strain energy density-transfer parameter (SEDTP) were developed to quantify the screw–bone load sharing. Lower STP and SEDTP values indicate weak stress and strain energy density transfer to bone which is a sign of stress shielding. The results indicated that STP and SEDTP values for FGM screw are higher than those of a fully metal screw. Moreover, reducing elastic modulus of metal fraction and increasing the volume fraction of ceramic decrease the stress shielding. For a partially graded screw (with both homogenous and FGM parts), the longer FGM part is, the greater are STP and SEDTP values. Furthermore, the results showed that decreasing compositional distribution exponent which shows composition change of FGM content from metal fraction toward ceramic fraction, increases the parameters. Results from this study are in admissible agreement with available clinical and experimental study.

کلیدواژه‌ها [English]

  • bone remodeling
  • Compositional distribution exponent
  • finite element method
  • Functionally graded material
  • Orthopedic screw
  • Strain energy density
  • Stress shielding
  • Ti-Hap
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