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Logo for the Journal of Rehab R&D
Volume 43 Number 2, March/April 2006
Pages 209 — 218

Abstract - Pressure changes under the ischial tuberosities of seated individuals during sacral nerve root stimulation

Liang Qin Liu, MBBS;1-2 Graham P. Nicholson, PhD;3 Sarah L. Knight, PhD;1-2 Ramesh Chelvarajah, MRCS;1 Angela Gall, MRCP;4 Fred R. I. Middleton, FRCP;4 Martin W. Ferguson-Pell, PhD;3 Michael D. Craggs, PhD;1-2*

1Spinal Research Centre, Royal National Orthopaedic Hospital (RNOH), Stanmore, United Kingdom; 2Institute of Urology, University College London, London, United Kingdom; 3Aspire Centre for Disability Sciences, University College London, London, United Kingdom; 4The London Spinal Cord Injuries Centre, RNOH, Stanmore, United Kingdom
Abstract — Neuromuscular stimulation via the sacral nerve roots is proposed for prevention of ischial pressure ulcers following a spinal cord injury (SCI). Acute effects of sacral functional magnetic stimulation (FMS) on seat interface pressure changes were investigated in five nondisabled volunteers. Similar effects were demonstrated with functional electrical stimulation in people with SCI who used a sacral anterior root stimulator implant. The results indicated that sacral nerve root stimulation, either by FMS or implanted electrical stimulation, induced gluteus maximus contraction and mild pelvic tilt sufficient for clinically significant reductions in ischial pressures during sitting.
Key words: functional electrical stimulation, functional magnetic stimulation, gluteal muscles, ischial pressure change, ischial tuberosity, pressure ulcer, sacral nerve root stimulation, seat interface pressure, spinal cord injury, wheelchair use.

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