Abstract: BACKGROUND: Abnormal standing posture is common and causes harm to people’s experience. It is very important to find a good standing posture.
OBJECTIVE: Taking Chinese healthy young people as the target population, the effects of different standing postures on spinal morphology and plantar pressure were discussed, and the harm of abnormal standing posture to human body was analyzed, so as to provide theoretical basis for finding a good standing posture.
METHODS: Forty-nine subjects were selected as the research subjects. The DIERS formetric 4D spine evaluation system combined with the plantar pressure system was used to collect the spine, pelvis and plantar parameters of the three standing positions of the in-toeing standing, the out-toeing standing and the parallel standing. The standing duration of each test was 10 seconds, and the test results were statistically described.
RESULTS AND CONCLUSION: (1) Compared with the out-toeing standing, the maximum lumbar lordosis angle, the peak pressure of left hind foot and right hind foot, and the proportion of forefoot pressure in the in-toeing standing increased significantly (P < 0.05), while the peak pressure of left forefoot, the contact area of left foot and right foot, and the proportion of hind foot pressure decreased significantly (P < 0.05). (2) Compared with parallel standing, the sagittal inclination angle, the maximum lumbar lordosis angle, the pelvic sagittal inclination angle, the pelvic torsion angle, the peak pressure of left hind foot, right forefoot, right hind foot, the average pressure of left foot and right foot, and the proportion of forefoot pressure in the in-toeing standing increased significantly (P < 0.05), and the contact area of left foot and right foot and the proportion of hind foot pressure decreased significantly (P < 0.05). (3) Compared with the parallel standing, the sagittal inclination angle, the maximum lumbar lordosis angle, the pelvic sagittal inclination angle, the pelvic torsion angle, the peak pressure of the left forefoot and the right forefoot, the average pressure of the left foot and the right foot, and the proportion of the forefoot pressure of the out-toeing standing were significantly increased (P < 0.05), and the proportion of the hindfoot pressure was significantly decreased (P < 0.05). (4) Among the three standing postures, the torso of the in-toeing and out-toeing standings leaned forward in the sagittal direction, the maximum lumbar lordosis angle increased, and the plantar pressure parameters were quite different, which was easy to cause damage. The spine and pelvis parameters of parallel standing tend to be neutral, and the difference of plantar pressure parameters is small. Therefore, parallel standing can be considered as a better standing position.

Key words: ">standing posture, plantar pressure, DIERS formetric 4D spinal evaluation system, spine, peak pressure, maximum lumbar lordosis angle, biomechanics