Buttock tissue response to loading in men with spinal cord injury

Area of Science:

• Biomedical Engineering
• Rehabilitation Science
• Clinical Biomechanics

Background:

• Individuals with spinal cord injury (SCI) using wheelchairs face high risk for pressure ulcers (PrUs).
• A spectrum of risk exists within this population, necessitating tools to differentiate risk levels.
• Understanding buttock tissue response to loading is crucial for predicting PrU development.

Purpose of the Study:

• To investigate the impact of clinically-measurable risk factors on tissue compliance and blood flow in young men with SCI.
• To identify biomechanical factors contributing to varying pressure ulcer risk.

Main Methods:

• Laser Doppler flowmetry measured blood flow at the ischial tuberosity under varying loads (40-60 mmHg and >200 mmHg).
• Myotonometer assessed buttock tissue compliance during unloading and loading.
• Measurements were taken in 28 young men with SCI.

Main Results:

• High loads significantly reduced blood flow; lower loads showed variable responses.
• Reduced blood flow at lower loads was observed in participants with a history of pressure ulcers and lower BMI.
• Buttock tissue displacement varied with BMI and smoking status.

Conclusions:

• Significant variability in tissue compliance and blood flow responses was found in a homogeneous SCI population.
• Biomechanical risk factors likely explain the spectrum of pressure ulcer risk among individuals with SCI.
• Further research into tissue biomechanics can inform PrU prevention strategies.