John D. Lloyd, PhD, CPE
Board Certified Ergonomist
32824 Michigan Avenue
San Antonio, Florida 33576
Tel: 813-624-8986
Email: DrJohnLloyd@Tampabay.RR.com
Biomechanical Assessment of Pressure-Relief and Repositioning Tasks in Persons with SCI
Abstract: Shoulder pain and dysfunction are common complaints among persons living with paraplegia. Two common activities that may contribute to this problem are pressure relief and repositioning using a trapeze. The trapeze is a widely used assistive device that has never been properly evaluated, and may be a significant contributor to shoulder injury over the long term. This study was designed to investigate the biomechanical stressors that lead to shoulder injury using a state-of-the-art 3D measurement technology as they engage in these two tasks.
Ten male veterans with paraplegia were recruited to perform pressure relief and repositioning tasks in a laboratory. Human motion, force and EMG of the bilateral anterior deltoid, pectoralis major, latissimus dorsi, tricep and bicep muscle groups was collected using VICON motion tracking technology, force sensing gloves and telemetric electromyography equipment.
Findings from this study graphically illustrate the 3D biomechanical demands at the shoulders, elbows and wrists during execution of these tasks. This allows us to identify the high-risk elements of the tasks. This may lead to the development and evaluation of nursing interventions to minimize the risk of developing chronic shoulder disorders.
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