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Related Experiment Videos

Reconstruction operations for acquired flatfoot: biomechanical evaluation

H B Kitaoka1, Z P Luo, K N An

  • 1Department of Orthopedics, Mayo Clinic and Mayo Foundation, Rochester, Minnesota 55905, USA.

Foot & Ankle International
|May 13, 1998
PubMed
Summary

Deltoid ligament reconstruction significantly improved flatfoot alignment more effectively than flexor digitorum longus tendon transfer in biomechanical testing. This finding suggests better surgical correction for posterior tibial tendon dysfunction.

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Area of Science:

  • Orthopedic Surgery
  • Biomechanics
  • Podiatry

Background:

  • Acquired flatfoot, often due to posterior tibial tendon dysfunction, presents challenges in surgical correction, particularly regarding alignment.
  • Existing surgical techniques may not adequately restore the foot's natural arch and alignment.

Purpose of the Study:

  • To compare the efficacy of deltoid ligament reconstruction versus flexor digitorum longus tendon transfer in correcting flatfoot deformity.
  • To evaluate the biomechanical impact of these procedures on foot alignment under simulated gait loads.

Main Methods:

  • Twelve fresh-frozen human foot specimens were utilized.
  • A flatfoot deformity was induced in each specimen.
  • Axial loads were applied to simulate the midstance phase of gait, and the effects of deltoid ligament reconstruction and flexor digitorum longus tendon transfer on arch height and joint alignment were measured.

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Main Results:

  • Deltoid ligament reconstruction led to a substantial improvement in foot position and a mean arch height increase of 10.3 mm.
  • Flexor digitorum longus tendon transfer showed minimal improvement in arch height (-0.6 mm) and resulted in a significant decrease compared to intact specimens.
  • Significant improvements in metatarsal-talar, calcaneal-talar, and talar-tibial alignment were observed after deltoid ligament reconstruction compared to flexor digitorum longus tendon transfer.

Conclusions:

  • Deltoid ligament reconstruction demonstrated superior effectiveness in restoring arch alignment in a biomechanical model of flatfoot.
  • Flexor digitorum longus tendon transfer was less effective in correcting the simulated flatfoot deformity.
  • While not advocating clinical use, these findings highlight the potential biomechanical advantages of deltoid ligament reconstruction for flatfoot alignment correction.