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[Effects of pressure on soft tissue stress distribution and muscle oxygenation in sacrum area for persons with spinal cord injury].

[Article in Chinese]

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School of Mechanical Engineering, Shandong University, Jinan 250061, China.


Sacrum area is the high-risk area for pressure ulcer to persons with spinal cord injury. A finite element model of the soft tissue in the sacrum area was established to analyze the stress distribution in the soft tissue with the human body lying down. In addition, the muscle oxygenation in the sacrum area was assessed by near-infrared spectroscopy (NIRS) before and after loading pressures. The results showed that the stress was mainly localized in the muscle layer and the stress in the bone-tissue interface was the maximal. When the loading reached 10kPa, the maximal stress in the muscle layer was 15kPa. The muscle oxygenation parameters changed significantly with the applied pressure and returned to normal level after the loading.

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