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The Relationship Between Forefoot Structure And Rearfoot And Midfoot Mechanics: 854 Board #76 10:30 AM – 12:00 PM

Buchanan, Kirsten1; Davis, Irene S. FACSM2

Medicine & Science in Sports & Exercise: May 2005 - Volume 37 - Issue 5 - p S159–S160
C-26: Free Communication/Poster – Gait and Balance: THURSDAY, JUNE 2, 2005 9:00 AM - 12:00 PM: ROOM: Ryman C2
Free

1Impact Sports Medicine, Falmouth, ME

2University of Delaware, Newark, DE

Email: kirstenb@maine.rr.com

It is often suggested that foot structure and foot mechanics are related.For example, forefoot varus is purported to be associated with midfoot and rearfoot pronation. However, there is little scientific evidence for these relationships.

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PURPOSE

To assess the relationship between forefoot structure and midfoot and rearfoot pronation. It was hypothesized that as forefoot varus increased, medial midfoot pressures and calcaneal eversion during walking would increase.

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METHODS

Subjects were healthy individuals (16 males, 16 females) aged 28.8 (+/− 8.8 yrs). Forefoot structure was measured by a single experienced physical therapist (ICC (2, k)=0.95). Subjects then underwent an instrumented gait analyis focusing on plantar pressures and rearfoot kinematics. Retro-reflective markers were placed on the tibia and calcaneus. Kinematics were collected with a 3D motion analysis system (120 Hz) and plantar pressures were collected with a pressure mat (70 Hz). The peak pressure of the medial midfoot area (MMPP) was used as an indication of midfoot pronation, and rearfoot eversion excursion (EvExc) was used to indicate rearfoot pronation. Linear regressions between forefoot varus and MMPP, as well as between forefoot varus and EvExc were performed. In addition, feet were subdivided into low, normal and high forefoot varus, based on the mean and standard deviation of a reference population of 102 feet. A one-way ANOVA was used to compare results between the foot categories.

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RESULTS

A significant relationship was found between forefoot position and MMPI (r=0.59, r 2 =0.35, p<0.01) and EvExc (r=0.65, r 2 =0.42, p<0.001). In addition, MMPI was significantly different (Fig. 1a) between all three forefoot groups (p<0.05). EvExc was significantly different (Fig. 1b) between the low and high forefoot varus groups (p<0.05). These data support the suggestions of a relationship between forefoot varus and dynamic midfoot and rearfoot pronation.

Figure 1

Figure 1

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CONCLUSIONS

Based on these results, it appears that as forefoot varus increases, both medial midfoot pressures and rearfoot eversion increases.

©2005The American College of Sports Medicine