The study of the changes of bearing ratio and plantar pressure under forefoot of hallux valgus foot

Objective To investigate the changes of bearing ratio and plantar pressure under forefoot of hallux valgus foot in the view of biomechanics Methods With the help of the foot pressure measurement system developed by our institute, the plantar pressure of feet(160 normal,100 mild and moderate hallux valgus, 56 severe hallux valgus) had been measured and acquired data were statistically analyzed. Results The bearing ratio of forefoot in mild-middle degree hallux valgus is larger than that in normal. The bearing ratio of forefoot in severe degree hallux valgus is between normal and mild-middle degree hallux valgus. There is a tendency in hallux valgus deformity that the pressure of forefoot moves outwards. This change is related with degree of deformity. Conclusion It is proved from biomechanical view that with the increase of deformity, bearing ratio of forefoot and pressure under metatarsals show different changes.