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Foot joint pressures during dynamic gait simulation

Journal of Foot and Ankle Research
Springer (Biomed Central Ltd.)
Publication Date
DOI: 10.1186/1757-1146-1-s1-o21
  • Oral Presentation

Abstract ral Journal of Foot and Ankle Research ss BioMed Cent Open AcceOral presentation Foot joint pressures during dynamic gait simulation W Brent Edwards*1, Erin D Ward2 and Timothy R Derrick1 Address: 1Department of Kinesiology, Iowa State University, Ames, IA, USA and 2Central Iowa Foot Clinic, Perry, IA, USA Email: W Brent Edwards* - [email protected] * Corresponding author Introduction Adult acquired flatfoot deformity is a progressive loss of normal function of the entire foot. A limited number of studies concerning joint pressures [1,2] with adult acquired flatfoot exist. Custom orthotics [3,4] are often used for conservative treatment of adult acquired flatfoot. Methods 5 fresh cadaveric specimens were connected to a dynamic gait simulator. I-scan #6900 sensors® were calibrated and surgically inserted into the subtalar (ST), naviculocunei- form (NC) calcaneocuboid (CC), and talonavicular (TN) joints using a joint spreader. Each foot was walked multi- ple trials across a force platform for three conditions (nor- mal, flatfoot, flatfoot-orthotic). The flatfoot condition was created by detaching the posterior tibial tendon from the simulator and surgically releasing the spring ligament complex and the plantar fascia. Joint pressure data were collected at 100 Hz. Peak pressures were averaged within subjects and effect sizes were calculated between condi- tions. Results Mean joint pressures ranged between 0.5 and 1.5 MPa (Figure 1). According to Cohen [5], effect sizes of .20, .50 and .80 rep- resent small, medium and large differences, respectively. Medium and large effect sizes were observed for the ST, NC, and CC joint (Table 1). Compared to the normal con- dition: ST pressures were lower during the orthotic condi- tion, NC pressures were lower during the flatfoot and orthotic conditions, and CC pressures were higher during the flatfoot condition. Compared to the flatfoot condi- tion: ST, NC, and CC pressures were all lower during the or

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