Distribution changes of forefoot plantar pressure in hallux valgus

Objective To investigate the changes of distribution of plantar pressure in Hallux Valgus and provide laboratory proof for clinical therapy and rehabilitation of hallux valgus.Method 17 cases of hallux valgus with 34 involved feet were examined.17 persons with normal feet were choosen as control group.Forefoot plantar pressure was measured during walking by Footscan system.The forefoot was divided into five regions according to the five metatarsals.The parameters,peak pressure(PP) and pressure time integral(PTI) of the five regions,were compared to evaluate the plantar pressure changes while walking.Results Forefoot plantar pressure distribution of hallux valgus is quite different from that of normal feet.Among five regions PP and PTI under the third metatarsal are maximum,which was(24.01±12.33)Pa,(6.89±3.02) respectively.While the maximum of normal feet was under the second metatarsal,which was(16.79±7.65)Pa,(6.03±2.72) respectively.Conclusions There are biomechanical differences between hallux valgus and normal feet which can be embodied by the distribution of plantar pressure.The center of plantar pressure distribution obviously shifts from interior to exterior.