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Biomechanical analysis of the role of shoe inserts for over pronated foot during running

Excessive pronation during stance phase of gait has been related with a higher risk of overuse injuries during running, although the mechanisms behind this relationship are still unclear [2] [3] [4]. Solutions to prevent injuries related with over pronation can be provided by special shoes[6], inserts [7] or orthotics [8]. Murley et al. 2009 [9] reviews several papers that have found evidence of the feasibility of preventing some lower limb injuries (specially femoral stress fractures and shin splints) with foot orthoses. In this study two types of medial wedged inserts for running shoes were compared with normal flat insoles in 11 subjects that ran on a treadmill. EMG, the foot eversion and acceleration values were measured to assess changes in the gait pattern of the lower limb. A repeated measurement ANOVA on the gait pattern parameters revealed no significant differences comparing the wedged insoles results with the control insoles results. The results showed that there was no effect on the gait pattern wearing medial wedged insoles after a short period of adaptation. Further studies are needed to test kinematic variables and the effect over a long period period in addition with a muscle fatigue analysis.

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13 Introduction 1.1 Pronation Subtalar joint pronation is a motion which combines dorsiflexion, abduction, and eversion of the foot which respect to the leg, providing the primary mechanism by which transverse rotations occur between the leg and foot [1]. Excessive and an increased velocity of pronation during stance, have been related with overuse injuries in running, although the mechanisms behind this relationship are still unclear [2] [3] [4]. Figura 1.1 Pronated foot Vs Normal foot (adapted from Philadelphia Runner website: http://www.philadelphiarunner.com) 1.2 Overuse Injuries Overuse injuries are those injuries that result from repetitive subtraumatic forces that overuse and stress the muscuskeletical tissues [5]. Willems et al. 2006 have identified the central heel strike, the excessive eversion and the increased lateral roll off of the ankle as risk factors for exercise related lower leg pain. Exercise related leg pain includes, shin splints, shin pain, medial tibial stress pain, periostitis, compartment syndrome and stress fractures [2]. On a second study, Willlems found that the risk factors running with shoes are the increased pronation excursion and accelerated reinversion[3]. These studies were carried on by comparing an injury group of subjects that developed exercise related lower leg pain with a group of subjects who had never Chapter1

Laurea liv.II (specialistica)

Facoltà: Ingegneria

Autore: Aron Teklemariam Contatta »

Composta da 82 pagine.

 

Questa tesi ha raggiunto 82 click dal 12/07/2012.

Disponibile in PDF, la consultazione è esclusivamente in formato digitale.