Objective:To examine the effects of external ankle support on vertical ground-reaction forces (VGRF) and kinematic data.Methods:Subjects completed 2 braced and 2 nonbraced 0.61-m hanging drop landings onto a force platform. Kinematic data were collected with 8 digital-optical cameras sampling at 120 Hz.Subjects:12 Division I female volleyball players.Statistical Analysis:A repeated-measures ANOVA with Bonferroni correction (P < .05) was used to determine whether significant differences existed between test conditions for peak VGRF, loading rate, hip angle, knee angle, and ankle angle at right-foot contact for peak 1 and peak 2 of the VGRF curve over the first 100 milliseconds of the landing phase, as well as total hip range of motion (ROM), total knee ROM, and total ankle ROM for the entire landing phase.Results:There were significant increases in peak P1 and LR1 and a significant decrease in ankle-angle change at right-foot contact in braced trials compared with the nonbraced condition.
Context:Because of research variability and the increasing use of orthotics to manage lower extremity problems, further research is warranted.Objective:To investigate the effect of rear-foot- and forefoot-posted (PAL) and mediolongitu-dinal arch-supported (SOLE) orthotics on plantar pressure (PP) during walking.Design:Repeated measures.Setting:Laboratory.Participants:17 subjects with forefoot varus.Intervention:Data were collected at 0 and 6 weeks for no-orthotic and orthotic conditions.Measurements:PPs were collected with the EMED Pedar measurement system.Results:Zero weeks: PAL increased PP in lateral forefoot (LFF), middle toes (MT), and lateral toes (LT) and decreased PP in lateral heel (LH), medial forefoot (MFF), and central forefoot (CFF). SOLE increased PP for midfoot (MF) and LT and decreased PP in medial heel (MH), LH, and CFF. 6 weeks: PAL increased PP in LFF, MT, and LT and decreased PP in LH, MFF, and CFF. SOLE increased PP in MF and decreased PP in MH, LH, and LFF.Conclusion:The SOLE orthotic appeared to be more effective in attaining the goals of custom-molded-orthotic intervention.
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