Biomechanical analysis of UCBL with articulated ankle AFO in a surgical stage II posterior tibial tendon dysfunction

M. Diamond, A. Bonner, D. Pedroso, E. Milne, L. Latta

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Introduction: The purpose of this paper is to demonstrate the biomechanical efficacy of a custom molded UCBL with articulated ankle AFO to functionally brace and conservatively treat posterior tibial tendon dysfunction (PTTD). Methods: Cadaver legs were thawed and a plaster mold of the foot and ankle in neutral position was made. From the mold a custom UCBL foot insert was fabricated and assembled to an AFO with an articulated ankle joint for each leg. Ten Nm dorsiflexion (DF), plantarflexion (PF), varus (VR) and valgus (VL) loads were applied to the cadaver foot and fluoroscopy was used to image the positions of the ankle and subtalar joints before and after simulation of PTTD both with and without the AFO. PTTD Stage 2 was surgically created with a scalpel through a small skin wound. Measures of ankle and subtalar position were made from the fluoroscopic images with Imagpro software. Results: The AFO had minimal effect on sagittal ROM: 47.6° ± 19.8 without; and, 45.5 ° ± 21.6 with the AFO. The AFO controlled coronal plane ROM (P < 0.002): 27.0 ° ± 9.0 without; and, 9.7 ° ± 3.3 with the AFO. The AFO was most effective at reducing VL motion: 19.4 ° ± 8.5 vs. 5.1 ° ± 1.1, compared to VR motion: 7.7 ° ± 2.5 vs. 5.6 ° ± 2.2. Conclusions: The articulated AFO with a custom molded UCBL foot insert is effective at resisting varus - valgus loading at the ankle and subtalar joints, which is critical for the treatment of PTTD. The AFO does allow for near normal flexion - extension movement which is desirable.

Original languageEnglish (US)
Title of host publication25th Southern Biomedical Engineering Conference 2009
Pages101-102
Number of pages2
DOIs
StatePublished - Nov 6 2009
Event25th Southern Biomedical Engineering Conference 2009 - Miami, FL, United States
Duration: May 15 2009May 17 2009

Publication series

NameIFMBE Proceedings
Volume24
ISSN (Print)1680-0737

Other

Other25th Southern Biomedical Engineering Conference 2009
CountryUnited States
CityMiami, FL
Period5/15/095/17/09

Keywords

  • Ankle Foot Orthosis
  • Articulated ankle
  • Posterior tibial tendon dysfunction
  • PTTD
  • UCBL/AFO University of California Berkley

ASJC Scopus subject areas

  • Biomedical Engineering
  • Bioengineering

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    Diamond, M., Bonner, A., Pedroso, D., Milne, E., & Latta, L. (2009). Biomechanical analysis of UCBL with articulated ankle AFO in a surgical stage II posterior tibial tendon dysfunction. In 25th Southern Biomedical Engineering Conference 2009 (pp. 101-102). (IFMBE Proceedings; Vol. 24). https://doi.org/10.1007/978-3-642-01697-4_35