Sacral interface pressure can be alleviated by repositioning with a small-angle change using an automated bed in patients with spinal cord injury

Abstract

Aim of the study: This study aimed to compare interface pressure and total contact area of the sacral region in different positions, including small-angle changes, in patients with spinal cord injury (SCI). Furthermore, we analyzed the clinical factors influencing pressure to identify the pressure injury (PI) high-risk group.

Materials and methods: An intervention was conducted for patients with paraplegia (n = 30) with SCI. In the first and second trials, interface pressure and total contact area of the sacral region were recorded from large- and small-angled positions using the automatic repositioning bed, which can change the angle of the back, lateral tilt, and knee.

Results: Positions with back raised ≥45° showed significantly higher pressure on the sacrum than most other positions. The pressure and contact area differences were statistically insignificant for combinations of small-angled changes <30°. Additionally, the duration of injury (β = 0.51, p = 0.010) and neurological level of injury (NLI) (β = -0.47, p = 0.020) were significant independent predictors of average pressure. Similarly, the duration of injury (β = 0.64, p = 0.001), the Korean version of the spinal cord independence measure-III (β = -0.52, p = 0.017), and body mass index (BMI; β = -0.34, p = 0.041) were significant independent predictors of peak pressure.

Conclusions: For repositioning, combinations of small-angle changes <30° effectively reduce pressure on the sacral region in patients with SCI. Lower BMI, longer duration of injury, lower functioning score, and NLI ≥ T7 are predictors of high sacral pressures, which increase the risk for PI. Therefore, patients with these predictors require strict management.

Keywords: Interface pressure; Paraplegia; Position angle; Pressure injury; Repositioning; Spinal cord injury.