Plantar Loading in Runners with Plantar Fasciitis

NewsBot · Sep 17, 2015

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Dynamic Patterns of Forces and Loading Rate in Runners with Unilateral Plantar Fasciitis: A Cross-Sectional Study.
Ribeiro AP, Jo?o SM, Dinato RC, Tessutti VD, Sacco IC
PLoS One. 2015 Sep 16;10(9):e0136971. doi: 10.1371/journal.pone.0136971. (full text)

AIM/HYPOTHESIS:
The etiology of plantar fasciitis (PF) has been related to several risk factors, but the magnitude of the plantar load is the most commonly described factor. Although PF is the third most-common injury in runners, only two studies have investigated this factor in runners, and their results are still inconclusive regarding the injury stage.
OBJECTIVE:
Analyze and compare the plantar loads and vertical loading rate during running of runners in the acute stage of PF to those in the chronic stage of the injury in relation to healthy runners.
METHODS:
Forty-five runners with unilateral PF (30 acute and 15 chronic) and 30 healthy control runners were evaluated while running at 12 km/h for 40 meters wearing standardized running shoes and Pedar-X insoles. The contact area and time, maximum force, and force-time integral over the rearfoot, midfoot, and forefoot were recorded and the loading rate (20-80% of the first vertical peak) was calculated. Groups were compared by ANOVAs (p<0.05).
RESULTS:
Maximum force and force-time integral over the rearfoot and the loading rate was higher in runners with PF (acute and chronic) compared with controls (p<0.01). Runners with PF in the acute stage showed lower loading rate and maximum force over the rearfoot compared to runners in the chronic stage (p<0.01).
CONCLUSION:
Runners with PF showed different dynamic patterns of plantar loads during running over the rearfoot area depending on the injury stage (acute or chronic). In the acute stage of PF, runners presented lower loading rate and forces over the rearfoot, possibly due to dynamic mechanisms related to pain protection of the calcaneal area.
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NewsBot · Jan 21, 2016

Relationships between static foot alignment and dynamic plantar loads in runners with acute and chronic stages of plantar fasciitis: a cross-sectional study.
Ribeiro AP et al
Braz J Phys Ther. 2016 Jan 19

BACKGROUND:
The risk factors for the development of plantar fasciitis (PF) have been associated with the medial longitudinal arch (MLA), rearfoot alignment and calcaneal overload. However, the relationships between the biomechanical variables have yet to be determined.
OBJECTIVE:
The goal of this study was to investigate the relationships between the MLA, rearfoot alignment, and dynamic plantar loads in runners with unilateral PF in acute and chronic phases.
METHOD:
Cross-sectional study which thirty-five runners with unilateral PF were evaluated: 20 in the acute phase (with pain) and 15 with previous chronic PF (without pain). The MLA index and rearfoot alignment were calculated using digital images. The contact area, maximum force, peak pressure, and force-time integral over three plantar areas were acquired with Pedar X insoles while running at 12 km/h, and the loading rates were calculated from the vertical forces.
RESULTS:
The multiple regression analyses indicated that both the force-time integral (R2=0.15 for acute phase PF; R2=0.17 for chronic PF) and maximum force (R2=0.35 for chronic PF) over the forefoot were predicted by an elevated MLA index. The rearfoot valgus alignment predicted the maximum force over the rearfoot in both PF groups: acute (R2=0.18) and chronic (R2=0.45). The rearfoot valgus alignment also predicted higher loading rates in the PF groups: acute (R2=0.19) and chronic (R2=0.40).
CONCLUSION:
The MLA index and the rearfoot alignment were good predictors of plantar loads over the forefoot and rearfoot areas in runners with PF. However, rearfoot valgus was demonstrated to be an important clinical measure, since it was able to predict the maximum force and both loading rates over the rearfoot.
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NewsBot · Mar 11, 2022

Influences of Plantar Impulse and Dynamic Longitudinal Arch Angle on Signs of Plantar Fasciitis in Long-Distance Runners.
Kongtong W, Limroongreungrat W, Khongprasert S.
JEPonline 2022;25(1):47-55.

This study evaluated plantar impulse, dynamic longitudinal arch (LA) angle, plantar fascia thickness (PFT), and pressure pain threshold (PPT) in 10 long-distance runners with plantar fasciitis (PF) and 10 controls without PF. The subjects were examined for PFT by ultrasonography. PPT score was determined using a pressure algometer. Moreover, the dynamic LA angle and the vertical ground reaction force were recorded using a motion capture system synchronized with a force plate during barefoot running at the speed of 3 to 3.67 m*[s.sup.-1] in the laboratory. An independent t-test was used to analyze differences between the PF and Control Groups. Runners with PF showed significant differences in braking (P=0.017) and propulsive (P=0.034) impulses, braking (P=0.043) and propulsive (P=0.004) LA angles, PFT (P Key Words: Dynamic Longitudinal Arch Angle, Long-Distance Runners Plantar Fasciitis, Plantar Impulse
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