Study on Gait Mechanics of Hallux Valgus Based on Plantar Pressure Test System and Three-Dimensional Gait Analysis Technique
Objective:To compare the changes of plantar pressure under gait mode between patients with hallux valgus and normal volunteers,and to explore the mechanical changes of foot caused by hallux valgus.Methods:A retrospective study was used to collect the data of plantar pressure and three-dimensional gait in walking mode of 47 patients(2 male and 45 female)with hallux valgus and 47 normal volunteers(2 male and 45 female)from October 2022 to June 2023.The dynam-ic peak force(PF),peak pressure(PP),peak impulse(PI),and three-dimensional gait parameters(stride length,pace,fre-quency,stride length,stride width,stride uniformity,support phase percentage,swing phase percentage,total double sup-port phase percentage,foot deviation angle,and gait cycle)from the first to fifth metatarsals(M1-M5)in walking mode between two groups were compared.Results:The peak force,peak pressure and peak impulse measurements of the M2 and M3 metatarsal heads in the hallux valgus group were significantly higher than those in the normal group,and the differ-ences were statistically significant(P＜0.05).There was no statistically significant difference in peak force,peak pressure and peak impulse under the metatarsal head between the two groups of M1,M4,and M5(P＞0.05).There was no statis-tically significant difference in the measurement values of two sets of spatiotemporal parameters(P＞0.05),including step length,step speed,step frequency,step amplitude,step width,and step uniformity.There was no statistically significant difference in the measured values of two sets of kinematic parameters(support phase percentage,swing phase percentage,total double support phase percentage,and gait cycle)(P＞0.05).The measured values of foot deviation angle in the hallux valgus group were significantly smaller than those in the normal group,and the difference was statis-tically significant(P＜0.05).Conclusion:Hallux valgus leads to an increase in the load on the forefoot,an outward move-ment trajectory,a decrease in foot deviation angle,and a change in the force line of the foot,and make the likelihood of potential damage to the hip and knee joints increase.
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