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Finite Element Study On Arthroscopic Anchor Design Aspects.

Mohamed El-Anwar1, Walid Osman2

  • 1Mechanical Engineering Department, National Research Centre, Cairo, Egypt.

Open Access Macedonian Journal of Medical Sciences
|March 22, 2019
PubMed
Summary
This summary is machine-generated.

Optimizing arthroscopic anchor design, specifically thread pitch, reduces bone stress while increasing anchor body stress. Anchor thread type minimally impacts bone but can reduce anchor body stress.

Keywords:
Arthroscopic anchorsDesignEndoscopyFinite element analysisInternal drive mechanismSuture eyelet

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Area of Science:

  • Orthopedic biomechanics
  • Biomaterials engineering
  • Surgical device design

Background:

  • Arthroscopic anchors are crucial for soft tissue reattachment in orthopedic surgery.
  • Understanding the biomechanical performance of arthroscopic anchors is essential for improving surgical outcomes.
  • Previous designs have not fully explored the impact of specific geometric parameters on anchor performance.

Purpose of the Study:

  • To investigate the influence of key design parameters on the biomechanical performance of arthroscopic anchors.
  • To evaluate the effects of thread type, pitch, and tip angle on stress distribution in anchors and surrounding bone.
  • To compare finite element analysis (FEA) predictions with experimental tensile testing results.

Main Methods:

  • Five distinct 3D arthroscopic anchor models were designed using CAD software.
  • Finite element analysis (FEA) was performed using ANSYS with a 300 N tensile load applied.
  • Prototypes underwent laboratory tensile testing to validate FEA results against experimental data.

Main Results:

  • FEA indicated that all tested arthroscopic anchor models maintained stresses within physiological limits for bone.
  • Thread pitch significantly influenced stress distribution on both the bone and the anchor body.
  • Critical stress zones were identified at the anchor-bone interface and the anchor eyelet region.

Conclusions:

  • Increasing thread pitch in arthroscopic anchors reduces bone stress but elevates stress on the anchor body.
  • Anchor thread type has minimal effect on bone but can mitigate anchor body stress, particularly with enhanced material around the eyelet.
  • The tip angle of arthroscopic anchors demonstrated a negligible impact on both bone and anchor body stresses.