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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, Sacco IC, Dinato RC, João SM - Braz J Phys Ther (2016)

Bottom Line: 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).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.

View Article: PubMed Central - PubMed

Affiliation: Departamento de Fisioterapia, Fonoaudiologia e Terapia Ocupacional, Faculdade de Medicina, Universidade de São Paulo, São Paulo, SP, Brazil.

ABSTRACT

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.

No MeSH data available.


Related in: MedlinePlus

- Image obtained by podoscope (A) and illustration of the areas of thefeet to calculate the longitudinal plantar arch index (MLA), where L:vertical line and areas A: rearfoot, B: midfoot and C: forefoot (B).
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f02: - Image obtained by podoscope (A) and illustration of the areas of thefeet to calculate the longitudinal plantar arch index (MLA), where L:vertical line and areas A: rearfoot, B: midfoot and C: forefoot (B).

Mentions: The footprint was acquired using a Carci(r) podoscope. For the barefootassessments, the subjects were positioned on the podoscope with 7.5 cm of ethylenevinyl acetate (EVA) placed between the feet. The footprint image was obtained with adigital camera, which was placed in front of the podoscope at a distance of 24 cm anda height of 45 cm (Figure 2). The EVAmeasurement was taken as a reference for the AutoCAD software 2005(r)image scale. In AutoCAD, a vertical line (L) was drawn from the second metatarsus tothe center of the calcaneus. Then, the L line was divided into three parts for thedelineation of the forefoot, midfoot, and rearfoot areas13,34.


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, Sacco IC, Dinato RC, João SM - Braz J Phys Ther (2016)

- Image obtained by podoscope (A) and illustration of the areas of thefeet to calculate the longitudinal plantar arch index (MLA), where L:vertical line and areas A: rearfoot, B: midfoot and C: forefoot (B).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4835169&req=5

f02: - Image obtained by podoscope (A) and illustration of the areas of thefeet to calculate the longitudinal plantar arch index (MLA), where L:vertical line and areas A: rearfoot, B: midfoot and C: forefoot (B).
Mentions: The footprint was acquired using a Carci(r) podoscope. For the barefootassessments, the subjects were positioned on the podoscope with 7.5 cm of ethylenevinyl acetate (EVA) placed between the feet. The footprint image was obtained with adigital camera, which was placed in front of the podoscope at a distance of 24 cm anda height of 45 cm (Figure 2). The EVAmeasurement was taken as a reference for the AutoCAD software 2005(r)image scale. In AutoCAD, a vertical line (L) was drawn from the second metatarsus tothe center of the calcaneus. Then, the L line was divided into three parts for thedelineation of the forefoot, midfoot, and rearfoot areas13,34.

Bottom Line: 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).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.

View Article: PubMed Central - PubMed

Affiliation: Departamento de Fisioterapia, Fonoaudiologia e Terapia Ocupacional, Faculdade de Medicina, Universidade de São Paulo, São Paulo, SP, Brazil.

ABSTRACT

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.

No MeSH data available.


Related in: MedlinePlus