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Related Concept Videos

Ankle Joint01:10

Ankle Joint

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The ankle is formed by the talocrural joint (crural = leg). It consists of the articulations between the talus bone of the foot and the distal ends of the tibia and fibula of the leg. The superior aspect of the talus bone is square-shaped and has three areas of articulation. The top of the talus articulates with the inferior tibia. This is the portion of the ankle joint that carries the body weight between the leg and foot. The sides of the talus are firmly held in position by the articulations...
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Force-controlled dynamic wear testing of total ankle replacements.

Jörn Reinders1, Falko von Stillfried1, Emel Altan1

  • 1Laboratory of Biomechanics and Implant Research, Clinic for Orthopedics and Trauma Surgery, Center for Orthopedics, Trauma Surgery and Spinal Cord Injury, Heidelberg University Hospital, 69118 Heidelberg, Germany.

Acta Biomaterialia
|December 3, 2014
PubMed
Summary

This study developed a new force-controlled wear test for total ankle replacements. The test generated relevant wear mass and biologically sized particles, crucial for understanding implant longevity.

Keywords:
Ankle arthroplastyAnkle replacementWearWear particlesWear simulation

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Area of Science:

  • Biomedical Engineering
  • Orthopedic Surgery
  • Materials Science

Background:

  • Limited understanding of wear performance in total ankle replacements (TARs).
  • Need for standardized, in vitro testing methods to simulate in vivo conditions.
  • Wear debris generation is a critical factor in implant failure and osteolysis.

Purpose of the Study:

  • To develop and validate a force-controlled testing scenario for wear assessment of total ankle replacements.
  • To characterize the wear behavior and properties of wear particles generated from a mobile, three-component TAR design.
  • To establish a foundation for future standardized wear testing protocols in ankle arthroplasty.

Main Methods:

  • Development of a force-controlled wear testing system incorporating a cadaver-derived ankle stabilization model.
  • Definition of in vivo kinematics and kinetics using literature data and gait analysis.
  • Gravimetric assessment of wear and analysis of wear particle size, aspect ratio, and roundness.

Main Results:

  • A mean wear rate of 18.2±1.4 mm³/10⁶ cycles was determined for the tested TAR design.
  • Generated wear particles had a mean size of 0.23 μm, with an aspect ratio of 1.61±0.96 and roundness of 0.62±0.14.
  • Wear particles were found to be within a biologically relevant size range, indicating potential for osteolysis.

Conclusions:

  • The developed force-controlled wear test successfully generated significant wear mass and biologically relevant particles.
  • This testing methodology provides a crucial basis for future research and standardization of wear testing for total ankle replacements.
  • Understanding wear characteristics is essential for improving the long-term performance and survivability of ankle prostheses.