Influence of Extrinsic Plantar Flexors on Forefoot Loading During Heel Rise

Linda Ferris, Neil Sharkey, Tait S. Smith, Donald K. Matthews

Research output: Contribution to journalArticle

70 Citations (Scopus)

Abstract

This investigation studied the effects of simulated plantar flexor muscle activity on forefoot loading using a static cadaver model. Nine cadaver feet were mounted in an apparatus in the heel rise position. Using computer-controlled and pneumatic actuators, forces were simultaneously applied to the tendons of the triceps surae, flexor hallucis longus, flexor digitorum longus, peroneus brevis and longus, and tibialis posterior until 750 N of ground reaction force was achieved, at which time forefoot plantar pressure patterns were captured immediately with a pedobarograph. Second metatarsal bending moments were calculated from strain gauge data collected concurrently. Consecutive loading cycles were performed with sequential elimination of simulated muscle force from each tendon except the Achilles. Loss of simulated flexor hallucis longus activity significantly decreased great toe contact forces and significantly increased forces under the forefoot. Simulated loss of both the flexor hallucis longus and flexor digitorum longus caused significant decreases in contact area, pressure, and force beneath the toes and significant increases in contact area and force under the forefoot. Bending moments in the second metatarsal were shown to vary directly with peak pressure under the second metatarsal head (r = 0.801). These findings demonstrate the load distributing function of the extrinsic plantar flexors during heel rise.

Original languageEnglish (US)
Pages (from-to)464-473
Number of pages10
JournalFoot & Ankle International
Volume16
Issue number8
DOIs
StatePublished - Jan 1 1995

Fingerprint

Metatarsal Bones
Heel
Cadaver
Pressure
Hallux
Muscles
Achilles Tendon
Toes
Tendons
Foot

All Science Journal Classification (ASJC) codes

  • Surgery
  • Orthopedics and Sports Medicine

Cite this

Ferris, Linda ; Sharkey, Neil ; Smith, Tait S. ; Matthews, Donald K. / Influence of Extrinsic Plantar Flexors on Forefoot Loading During Heel Rise. In: Foot & Ankle International. 1995 ; Vol. 16, No. 8. pp. 464-473.
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Influence of Extrinsic Plantar Flexors on Forefoot Loading During Heel Rise. / Ferris, Linda; Sharkey, Neil; Smith, Tait S.; Matthews, Donald K.

In: Foot & Ankle International, Vol. 16, No. 8, 01.01.1995, p. 464-473.

Research output: Contribution to journalArticle

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