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Related Concept Videos

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When materials are subjected to forces that surpass their yield strength, they undergo a process known as plastic deformation. This results in a permanent alteration or strain in their structure. This concept can be specifically applied to circular shafts, where the deformation leads to a change in its shape. The precise evaluation of this plastic deformation requires understanding the stress distribution within the circular shaft, which is achieved by calculating the maximum shearing stress in...
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Plastic Deformations01:19

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Plastic deformation represents a fundamental concept in materials science, which explains the irreversible change in the shape of a material when it experiences stress beyond its elastic capability. This phenomenon is important in structural engineering, especially in designing and analyzing cantilever beams—structures that are securely fixed at one end and bear loads at the opposite end. When these beams are subjected to loads within their elastic range, they will return to their...
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Plastic Deformations01:14

Plastic Deformations

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It is essential to understand how structural members behave under plastic deformation when the bending stress exceeds the material's yield strength. This state of deformation permanently alters the shape of the member, in contrast to the linear elastic behavior observed before yielding. The strain at any point in the member is expressed in terms of maximum strain. Notably, the neutral axis, which coincides with the centroid during elastic bending, shifts away from the centroid under plastic...
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In wood construction, fasteners are essential for securing components together, with the connection strength largely dependent on the direct bearing between members. Various types of fasteners are employed, each suited to specific applications and structural requirements.
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The Effect of Construction and Demolition Waste Plastic Fractions on Wood-Polymer Composite Properties
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Locking Screws With a Threaded Degradable Polymer Collar Reduce Construct Stiffness Over Time.

Blake J Schultz1, Nirav H Amin2, Braden J Mattison2

  • 1Department of Orthopaedic Surgery, Stanford Medicine, Redwood City, CA.

Journal of Orthopaedic Trauma
|February 22, 2020
PubMed
Summary
This summary is machine-generated.

A novel locking plate with a degradable polymer collar offers dynamic fracture fixation, providing early stability and allowing for increased interfragmentary motion (IFM) crucial for bone healing. This construct shows potential for optimizing fracture repair by adapting stiffness over time.

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Area of Science:

  • Orthopedic biomechanics
  • Biomaterials science
  • Surgical innovation

Background:

  • Locking plates offer early fracture stability but can impede later bone healing by limiting interfragmentary motion (IFM).
  • An ideal orthopedic implant should provide initial rigidity for healing and later flexibility to promote secondary bone healing.
  • Degradable polymer technology presents a novel approach to dynamic implant functionality.

Purpose of the Study:

  • To evaluate a novel screw-plate construct using locking screws with a degradable polymer mechanism.
  • To compare the biomechanical properties of this novel construct with conventional locked plating.
  • To assess the potential for construct dynamization during the bone healing process.

Main Methods:

  • Synthetic bone models were subjected to monotonic axial compression and torsion tests.
  • Cyclic axial load to failure was performed on conventional locked plates (Group A), novel constructs before polymer dissolution (Group B), and after dissolution (Group C).
  • Interfragmentary motion (IFM) at near and far cortices was measured.

Main Results:

  • Group C (after polymer dissolution) exhibited significantly reduced axial and torsional stiffness compared to Groups A and B.
  • Significantly increased interfragmentary motion (IFM) was observed in Group C at both near and far cortices.
  • While Groups A and B showed similar stiffness and IFM, Group C demonstrated a significant decrease in load to failure, indicating construct dynamization.

Conclusions:

  • Locking plates with a degradable polymer collar demonstrate potential for in vitro construct dynamization.
  • This innovative design may facilitate optimal bone healing by modulating implant stiffness.
  • Further in vivo studies are necessary to validate performance under physiological loading conditions and assess healing outcomes.