The Effect of Plantar Fascia Release on Strain in the Spring and Long Plantar Ligaments

Abstract

The effect of plantar fascia release on strain in the spring and long plantar ligaments was investigated in 11 cadaveric feet. Strain gauges were placed in the spring and long plantar ligaments of each specimen, and cyclic axial loading was applied until reproducible hysteresis curves were observed in the ligaments before and after plantar fascia release. After release of the plantar fascia, the average strain observed in the spring ligaments at 920N of axial load increased by 52% (p<.001) and in the long plantar ligaments by 94% (p=.04). Longer resting lengths of the ligaments were also observed. Release of the plantar fascia significantly changed force distributions in the foot which may explain the development of deformities and symptoms observed clinically following this procedure.