Abstract
Subtalar arthroereisis has been proved to be an efficient method for correcting flexible
adult flatfoot. However, the optimal sinus tarsi implant is still debated and yet
to be determined. In the present study, we compared the biomechanical effects of type
I and II sinus tarsi implants in stage II adult-acquired flatfoot deformity (AAFD).
First, a finite element model of stage II AAFD was established in which virtual surgery
of subtalar arthroereisis was simulated. The indexes of plantar stress distribution,
peak von Mises of the medial and lateral columns, strain of the medial ligaments and
plantar fascia, arch height, talo-first metatarsal angle, calcaneus pitch angle, talonavicular
coverage angle, and hindfoot valgus angle were all compared and analyzed. The results
of the present study have validated the stage II AAFD finite element model by comparing
the simulation results with the same parameters measured from weightbearing radiographs
in the midstance phase. All the indexes showed that both types of arthroereisis can
lower the plantar pressure and the strain of the medial ligaments that support the
medial longitudinal arch and can shift the load of the medial column to the lateral
column. They can also help to correct the deformity and restore the arch. However,
the type II sinus tarsi implant design exhibited a more obvious effect than that of
type I.
Level of Clinical Evidence
Keywords
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Article info
Publication history
Published online: June 13, 2017
Footnotes
Financial Disclosure: None reported.
Conflict of Interest: None reported.
J. Xu and X. Ma contributed equally to this research.
Identification
Copyright
© 2017 by the American College of Foot and Ankle Surgeons. All rights reserved.
