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Jay Hertel, Craig R. Denegar, W.E. Buckley, Neil A. Sharkey and Wayne L. Stokes

Objective:

To identify changes in sagittal- and frontal-plane center of pressure (COP) excursion length and velocity during single-leg stance under 6 orthotic conditions.

Design:

1 × 6 repeated-measures.

Setting:

University biomechanics laboratory.

Participants:

Fifteen healthy young adults without excessive forefoot, arch, or rear-foot malalignments.

Measurements:

Selected variables of COP length and velocity were calculated in both the frontal and sagittal planes during three 5-second trials of quiet unilateral stance.

Methods:

Postural control was assessed under 6 conditions: shoe only and 5 orthotics.

Results:

The medially posted orthotic caused the least frontal COP length and velocity, and the Cramer Sprained Ankle Orthotic® caused the greatest frontal-plane sway. No significant differences were found between the different orthotic conditions in sagittal-plane measures.

Conclusions:

Differently posted rear-foot orthotics had various effects on frontal-plane postural control in healthy participants. Further research is needed on pathological populations.