Background The tibialis posterior has a important key role as an invertor of the rearfoot. Also providing dynamic support across the midfoot. The value of the tibialis posterior shown by biomechanical research conducted on patients with posterior tibialis tendon dysfunction. One method of assessing a muscle’s contribution to a specific movement pattern is via fatigue-inducing exercise of that muscle. Consequently, to realize the role of tibialis posterior fatigue on foot mechanics it seems prudent to use an exercise that more selectively activates this muscle (1,2).
Objectives The purpose of this study is to investigate dynamic and static foot parametres changed by tibialis posterior muscle fatique protocol.
Methods Thirty patients were participated in this study. Socio-dermographic and descriptive characteristics of the participants were recorded. The changes on the dynamic and static parametres of foot were measured by pedobarography. The two exercises selected for the fatigue protocol are: 1-Unilateral heel raise 2-Close chain resisted foot adduction. Fatigue level was measured by Borg scale. Static and dynamic parameters obtained before and after fatigue protocol were compared.
Results The mean age of the patients was 24,88 ± 4,39 years, mean height was 171 ± 7,89 cm and mean weight was 68,7 ± 14,5 kg. We found significiant increase in the maximum pressure measurement of mid foot (p= 0,004). In the total contact area during the static position, there were no significant changes (p>0.05). Participants’ maximal pressure in the middle standing phase was changed from 19,78 ± 10,71 N/cm2 to 22.89 ± 13.03 N/cm2 after fatigue protocol in medial of middle foot (p=0.03).
Conclusion According to the results, there was a correlation between the fatique of tibialis posterior and the static and dynamic parameters of foot. The increase in the middle foot peak pressure distributions after the fatigue protocol of the tibialis posterior muscle can be explained as the increase of the angular amount of pronation and prolongation of the time with the middle standing phase. Increase in pressure forces of the middle foot and increase in percentages of the area cause increase of the weight in the front foot during the gait cycle. Thus, fatigue protocol causes similar effects as tibialis posterior muscle dysfunction.
References  Bubra, P. S., Keighley, G., Rateesh, S., & Carmody, D. (2015). Posterior tibial tendon dysfunction: an overlooked cause of foot deformity. Journal of family medicine and primary care, 4(1), 26.
 Pohl, M. B., Rabbito, M., & Ferber, R. (2010). The role of tibialis posterior fatigue on foot kinematics during walking. Journal of foot and ankle research, 3(1), 6.
Disclosure of Interests None declared
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