This study examined the impact of wearing functional foot orthotics (FFOs) on the pelvic angle among young adults who have flatfoot, using a VICON Motion System device.
The study included college students with no musculoskeletal disease who were diagnosed with flatfoot and had a calcaneal pitch angle less than 15 degrees.
The FFOs worn by the subjects were customised for each individual’s foot shape and created with thermoplastic materials; the foot orthotic was designed for each subject by positioning the heel bone vertical to the ground whilst maintaining the natural position of the subtalar joint.
Measurements were taken and an evaluation was performed while weight was loaded under the realigned condition of the foot.
To measure change in the pelvic angle, data from walking on a previously fabricated Walkway before and after wearing the customised FFOs was analysed using high-quality 3D cameras and the VICON Motion System.
To measure the pelvic angle in the stance period during walking, markers were placed on the anterior superior iliac spine (ASIS) and anterior inferior iliac spine (AIIS) bilaterally.
The dynamic change was quantified to compute the difference in the pelvic angle on the left and right sides.
Examining the change in the pelvic angle during the stance period before and after wearing the FFO revealed that the angle significantly decreased on the left and right sides in the pre-stance, mid-stance, pre-swing and mid-swing periods after wearing the FFO.
Although the angle decreased after wearing the FFO, compared to before, the decrease was not significant; this implies that wearing a custom-fit FFO ameliorates tension in the sole muscle and fascia and prevents the decrease of the plantar arch during the mid-stance and mid-swing periods in flatfoot walking, resulting in a decrease in the pelvic angle.
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