The Effect of 6 Weeks of Custom-molded Foot Orthosis Intervention on Postural Stability in Participants With ???7 Degrees of Forefoot Varus

OBJECTIVE: Postural stability (PS) was assessed in a group of participants with >or=7 degrees of forefoot varus (FV) after 6 weeks of custom-molded functional foot orthosis (FO) intervention to investigate the effect of FO intervention in a population that may have decreased PS due to their foot structure. DESIGN: A force platform was used to assess right and left single-limb stance position and eyes open and eyes closed condition PS. SETTING: PS was assessed in a biomechanics research laboratory. PARTICIPANTS: Twelve participants with >or=7 degrees of FV (MFV) and 5 participants with <7 degrees of FV (LFV) participated in the study. INTERVENTIONS: PS of the MFV group was assessed initially when FOs were received and after 6 weeks of FO intervention. The LFV group PS was assessed during initial and 6-week testing sessions. MAIN OUTCOME MEASURES: The root mean square of the center of pressure velocity was used to quantify single-limb stance PS during no FO and FO conditions. RESULTS: LFV group PS did not change significantly (P=0.829) over the 6-week time period. Significant improvement was, however, reported in the MFV group anteroposterior (P=0.003) and mediolateral (P=0.032) PS at the 6-week assessment versus the initial assessment during both the noFO and FO conditions. CONCLUSIONS: Six weeks of FO intervention may significantly improve PS in participants with >or=7 degrees of FV both when wearing FOs and when not wearing FOs.