The purpose of this current study was to measure the knee joint angle and plantar pressure distribution between hallux valgus group and normal group under jogging condition. To reveal relationship of plantar pressure distribution and knee joint angle. Investigated that lower extremity mechanics of jogging in young female with mild hallux valgus. Sixteen young, healthy females volunteered to take part in this study. Kinematic data from a three-dimensional motion analysis system and plantar pressure distribution from Pedar-X system were collected to describe lower extremity mechanics while hallux valgus subjects jogging at a natural speed. The results found that knee joint angle of hallux valgus in frontal and transverse plane was obviously different under jogging condition. In frontal plane, the initial state of adduction angle (control group (CO) = 1.73 °, hallux valgus group (HV) = 8.33 °) of two group was markedly different at the beginning of the support (0-10%). During jogging gait cycle, knee abduction angle peak of normal group was 8.46°, and knee adduction angle peak of hallux valgus group was 8.61°. In the transverse plane, knee external rotation angle in the initial state of normal group was 21.93° while knee external rotation angle of hallux valgus was 4.89°. The results of plantar pressure found that bearing pressure regions was offshore in hallux valgus group. These changes would affect the movement of knee joint, and it suggested that hallux valgus group have higher risk for knee osteoarthritis. These results also suggested that hallux valgus deformity has influence on knee joint. We cannot be ignored in the process of the research and therapeutic with hallux valgus.
Hallux valgus is a common foot deformity with a multifactorial etiology. Factors associated with the development of hallux valgus (HV) are multifactorial and the etiology of hallux valgus remains unclear. The purpose of this study was to measure the biomechanical relationship between Hallux Valgus Angle (HVA), intermetatarsal Angle (IMA), Interphalangeal Angle (IPA), and metatarsal horizontal angle, in order to reveal the tendency of metatarsal horizontal angle along with hallux valgus angle increasing. Foot models of nine subjects are built through CT scan and editing software and calculated metatarsal horizontal angles using motion analysis system. It showed that with the increased of HVA, the metatarsal horizontal angle of the first to fifth was decreased. This method and results maybe have a new sight to reveal the characters of HV patients. Keywords: Hallux valgus; Metatarsal horizontal angle; Foot Models
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