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Related Concept Videos

Ankle Joint01:10

Ankle Joint

3.7K
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...
3.7K

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Related Experiment Video

Updated: Apr 11, 2026

Treatment of Ankle Osteoarthritis with Total Ankle Replacement Through a Lateral Transfibular Approach
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Evaluating Component Migration: Comparing Two Generations of the INBONE(®) Total Ankle Replacement.

Stephen A Brigido1, Garrett M Wobst2, Melissa M Galli3

  • 1Fellowship Director and Department Chair, Foot and Ankle Reconstruction, Foot and Ankle Department, Coordinated Health, Bethlehem, PA.

The Journal of Foot and Ankle Surgery : Official Publication of the American College of Foot and Ankle Surgeons
|June 3, 2015
PubMed
Summary

This study compared implant migration in two total ankle replacement (TAR) systems: INBONE I with a stemmed talar component and INBONE II without. No significant difference in migration was found between the two TAR designs after 12 months.

Keywords:
ankle joint surgeryjoint prosthesisosteoarthritissubsidencetotal ankle replacement

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Area of Science:

  • Orthopedic surgery
  • Biomedical engineering
  • Implant biomechanics

Background:

  • Total ankle replacement (TAR) aims to restore function but faces challenges like aseptic loosening and implant failure due to compressive forces.
  • Evolving TAR designs seek to improve longevity and reduce complications.
  • The integrity of the talus is crucial for ankle implant stability.

Purpose of the Study:

  • To compare implant migration between the INBONE I (stemmed talar component) and INBONE II (non-stemmed talar component) total ankle replacement systems.
  • To investigate the hypothesis that a stemmed talar component might lead to greater implant migration due to potential talar weakening.
  • To evaluate early-stage migration patterns in these two distinct TAR designs.

Main Methods:

  • A comparative study involving 35 patients who underwent total ankle replacement (20 with INBONE I, 15 with INBONE II).
  • Implant migration was assessed using anteroposterior radiographs taken immediately post-surgery and at 12 months.
  • Measurements compared the tibial component's apex to specific points on the talar component (distal stem or mid-saddle).

Main Results:

  • No statistically significant difference in implant migration was observed between the INBONE I (0.7 ± 1.2 mm) and INBONE II (0.6 ± 1.3 mm) systems at the 12-month follow-up (p = 0.981).
  • The initial hypothesis that the stemmed component would cause greater migration was not supported by the 12-month data.
  • Early migration patterns did not reveal a significant divergence between the stemmed and non-stemmed talar components.

Conclusions:

  • Based on 12-month follow-up, the presence or absence of a stemmed talar component in these specific total ankle replacement designs did not significantly affect early implant migration.
  • Further research with larger patient cohorts and extended follow-up periods (beyond 12 months) is necessary to ascertain long-term implant stability and migration trends.
  • Longer-term studies are crucial to confirm the absence of differential migration between stemmed and non-stemmed talar components in total ankle replacement over time.