Effects of plantar fascia on first metatarsophalangeal joint stress in different foot types
© Mootanah et al; licensee BioMed Central Ltd. 2014
Published: 8 April 2014
Osteoarthritis (OA) is the leading cause of disability in older adults  and 1st metatarsophalangeal joint (MTPJ) OA, is the most common form of OA in the foot . Many foot pathologies are of a biomechanical nature and often associated with one foot type over another [3, 4]. OA is postulated to result from elevated joint stress. However, the link between stress distribution in the 1st MTPJ and different foot types is not well understood. Furthermore the tension band effect of the plantar fascia upon 1st MTP joint function is also not well understood.
A high resolution 7 Tesla MRI was used to create a geometrically accurate 3D model of the 1st MTPJ using Mimics v14 imaging software. To simulate rectus, planus and cavus feet, 1st metatarsal declination angles of 20.2°, 10.1° and 30.7° were constructed. Plantar fascia material properties were altered. Physiological material properties and boundary conditions were applied to solve for stress, using ABAQUS. The ligaments were simulated by linear spring elements. The base of the first metatarsal bone was mechanically grounded in this model. Plantar loading conditions were applied, based on plantar pressure data collected from different foot types.
This work was in part supported by an NIH grant 1R03HD053135-01.
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