Static Foot Structure May Predict Midfoot Mechanics

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Presentation transcript:

Static Foot Structure May Predict Midfoot Mechanics Mark Olsen, BS Dustin Bruening, PhD A. Wayne Johnson, PhD, PT Sarah Ridge, PhD Presented at iFAB 2018

Purpose Clinical interventions for foot injury prevention are often prescribed based on static measures of foot structure. However, this convention merits further investigation as the static- dynamic relationship has only been explored in walking and running. The primary aim of this study was to explore the relationship between static foot structure and dynamic midfoot kinematics and kinetics during a barefoot single-leg landing.

Methods 48 females (age=20.4±1.8 yr, height=1.6±0.06 m, weight=57.3±5.5 kg) Arch Height Index Measurement System (AHIMS) 14-camera motion capture system (Vicon) / Two in-ground force platforms (AMTI) Subjects hung from wooden rings and performed barefoot single-leg drop landings from a height of 0.4m

Methods Multi-segment foot model by Bruening et al. Accounting for all tarsal movement not just midtarsal joint PCCs were calculated for static and dynamic variables using paired t- tests in SAS Bruening D, et al. Gait Posture. 2012 Oct; 35(4):529–34.

Results Standing AHI was correlated negatively with sagittal plane midtarsal ROM (r=-0.32032, p=0.0264) and positively with midtarsal work (r=0.33180, p=0.0212). Static MA was correlated positively with sagittal plane midtarsal ROM (r=0.48336, p=0.0005) and negatively with midtarsal work (r=-0.32321, p=0.0250). Table 1 Raw data for static and dynamic variables Standing AHI Static MA (deg) Midtarsal ROM (deg) Midtarsal Work (J·kg-1) Mean ± SD 0.324 ± 0.019 -22.475 ± 5.229 27.041 ± 6.916 -0.415 ± 0.131

Discussion The strong inverse correlation between the standing AHI and static MA suggests that either method is appropriate for characterizing static foot structure in clinical and research settings Static foot structure was able to predict 31-48% of variation associated with dynamic midfoot function during a landing task Other structures must be influencing the dynamic control of the midtarsal joint as noted by the lack of strong association A higher impact dynamic task, such as a drop landing, may required to properly observe a static-dynamic relationship

Conclusion Midfoot function may be predictable without having to administer dynamic testing accompanied by complex collection processes and analyses. Static foot structure may be a valuable clinical tool in assessing midfoot function relating to injury risk in athletes, who participate in high-impact loading activities, as well as in pathological populations.