Manual of Rheumatology and Outpatient Orthopedic Disorders
FIG. 56-18. Lying on your back with knees bent, press the small of your back into the bed. Tighten your abdominal and buttock muscles .
Books@Ovid
Copyright 2000 by Lippincott Williams & Wilkins
Stephen A. Paget, M.D., Allan Gibofsky, M.D., J.D. and John F. Beary, III, M.D.
Manual of Rheumatology and Outpatient Orthopedic Disorders