Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/17760
Title: Biomechanics of first ray hypermobility : an investigation on joint force during walking using finite element analysis
Authors: Wong, DWC
Zhang, M 
Yu, J
Leung, AKL 
Keywords: Hallux valgus
Ligament laxity
Metatarsus primus varus
Issue Date: 2014
Publisher: Elsevier
Source: Medical engineering & physics, 2014, v. 36, no. 11, p. 1388-1393 How to cite?
Journal: Medical engineering & physics 
Abstract: Hypermobility of the first ray is suggested to contribute to hallux valgus. The investigation of first ray hypermobility focused on the mobility and range of motion that based on manual examination. The load transfer mechanism of the first ray is important to understand the development and pathomechanism of hallux valgus. In this study, we investigated the immediate effect of the joint hypermobility on the metatarsocuneiform and metatarsophalangeal joint loading through a reduction of the stiffness of the foot ligaments. A three-dimensional foot model was constructed from a female aged 28 via MRI. All foot and ankle bones, including two sesamoids and the encapsulated bulk tissue were modeled as 3D solid parts, linking with ligaments of shell elements and muscles connectors. The stance phase of walking was simulated by the boundary and loading conditions obtained from gait analysis of the same subject.Compared with the normal foot, the hypermobile foot had higher resultant metatarsocuneiform and metatarsophalangeal joint forces. The increases accounted for 18.6% and 3.9% body weight. There was also an abrupt change of metatarsocuneiform joint force in the medial-lateral direction. The predicted results represented possible risk of joint problems and metatarsus primus varus.
URI: http://hdl.handle.net/10397/17760
ISSN: 1350-4533
DOI: 10.1016/j.medengphy.2014.03.004
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