Spinal muscles can create compressive follower loads in the lumbar spine in a neutral standing posture

McGill, 1990, Loads on the lumbar spine and associated tissues, 65 Nachemson, 1987, Lumbar intradiscal pressure, 191 Schultz, 1987, Loads on the lumbar spine, 204 Rohlmann, 1997, Loads on an internal spinal fixation device during walking, J Biomech, 30, 41, 10.1016/S0021-9290(96)00103-0 Lucas, 1961 Crisco, 1992 Crisco, 1992, Euler stability of the human ligamentous spine. Part II: Experiment, Clin Biomech, 7, 27, 10.1016/0268-0033(92)90004-N Patwardhan, 1999, A follower load increases the load-carrying capacity of the lumbar spine in compression, Spine, 24, 1003, 10.1097/00007632-199905150-00014 Patwardhan, 2003, Effect of compressive follower preload on the flexion-extension response of the human lumbar spine, J Orthop Res, 21, 540, 10.1016/S0736-0266(02)00202-4 Aspden, 1989, The spine as an arch. A new mathematical model, Spine (Phila Pa 1976), 14, 266, 10.1097/00007632-198903000-00005 Goel, 2005, Effects of charite artificial disc on the implanted and adjacent spinal segments mechanics using a hybrid testing protocol, Spine (Phila Pa 1976), 30, 2755, 10.1097/01.brs.0000195897.17277.67 Goel, 2006, Test protocols for evaluation of spinal implants, J Bone Joint Surg Am, 88, 103 Renner, 2007, Novel model to analyze the effect of a large compressive follower pre-load on range of motions in a lumbar spine, J Biomech, 40, 1326, 10.1016/j.jbiomech.2006.05.019 Rohlmann, 2006, Determination of trunk muscle forces for flexion and extension by using a validated finite element model of the lumbar spine and measured in vivo data, J Biomech, 39, 981, 10.1016/j.jbiomech.2005.02.019 Rohlmann, 2001, Influence of a follower load on intradiscal pressure and intersegmental rotation of the lumbar spine, Spine, 26, E557, 10.1097/00007632-200112150-00014 Wilke, 2003, ISSLS prize winner: a novel approach to determine trunk muscle forces during flexion and extension: a comparison of data from an in vitro experiment and in vivo measurements, Spine, 28, 2585, 10.1097/01.BRS.0000096673.16363.C7 Patwardhan, 2001, A frontal plane model of the lumbar spine subjected to a follower load: implications for the role of muscles, J Biomech Eng, 123, 212, 10.1115/1.1372699 Panjabi, 1992, The stabilizing system of the spine. Part I. Function, dysfunction, adaptation, and enhancement, J Spinal Disord, 5, 383, 10.1097/00002517-199212000-00001 Bergmark, 1989, Stability of the lumbar spine: a study in mechanical engineering, Acta Orthop Scand, 60, 1, 10.3109/17453678909154177 Gardner-Morse, 2004, Structural behavior of human lumbar spinal motion segments, J Biomech, 37, 205, 10.1016/j.jbiomech.2003.10.003 Kiefer, 1998, Synergy of the human spine in neutral postures, Eur Spine J, 7, 471, 10.1007/s005860050110 Shirazi-Adl, 2002, Muscle force evaluation and the role of posture in human lumbar spine under compression, Eur Spine J, 11, 519, 10.1007/s00586-002-0397-7 Cholewicki, 1995, Comparison of muscle forces and joint load from an optimization and EMG assisted lumbar spine model: towards development of a hybrid approach, J Biomech, 28, 321, 10.1016/0021-9290(94)00065-C El-Rich, 2004, Muscle activity, internal loads, and stability of the human spine in standing postures: combined model and in vivo studies, Spine (Phila Pa 1976), 29, 2633, 10.1097/01.brs.0000146463.05288.0e Shirazi-Adl, 2005, Spinal muscle forces, internal loads and stability in standing under various postures and loads—application of kinematics-based algorithm, Eur Spine J, 14, 381, 10.1007/s00586-004-0779-0 Stokes, 1995, Lumbar spine maximum efforts and muscle recruitment patterns predicted by a model with multijoint muscles and joints with stiffness, J Biomech, 28, 173, 10.1016/0021-9290(94)E0040-A Kim, 2008, Role of trunk muscles in generating follower load in the lumbar spine of neutral standing posture, J Biomech Eng, 130, 041005, 10.1115/1.2907739 Zhou, 2000, Geometrical dimensions of the lower lumbar vertebrae—analysis of data from digitised CT images, Eur Spine J, 9, 242, 10.1007/s005860000140 Bogduk, 1984, The applied anatomy of the thoracolumbar fascia, Spine, 9, 164, 10.1097/00007632-198403000-00006 Bogduk, 1992, Anatomy and biomechanics of psoas major, Clin Biomech, 7, 109, 10.1016/0268-0033(92)90024-X Bogduk, 1992, A universal model of the lumbar back muscles in the upright position, Spine, 17, 897, 10.1097/00007632-199208000-00007 Macintosh, 1986, The morphology of the human lumbar multifidus, Clin Biomech, 1, 196, 10.1016/0268-0033(86)90146-4 Macintosh, 1986, The biomechanics of the lumbar multifidus, Clin Biomech, 1, 205, 10.1016/0268-0033(86)90147-6 Macintosh, 1987, 1987 Volvo award in basic science. The morphology of the lumbar erector spinae, Spine, 12, 658, 10.1097/00007632-198709000-00004 Macintosh, 1991, The attachments of the lumbar erector spinae, Spine, 16, 783, 10.1097/00007632-199107000-00017 McGill, 1988, Measurement of the trunk musculature of active males using CT scan radiography: implications for force and moment generating capacity about the L4/L5 joint, J Biomech, 21, 329, 10.1016/0021-9290(88)90262-X An, 1998, Anatomy of the Spine, 1 Gray, 1984 Rickenbacher, 1985, The musculature of the back, 54 Chaffin, 1999 Stokes, 2001, Lumbar spinal muscle activation synergies predicted by multi-criteria cost function, J Biomech, 34, 733, 10.1016/S0021-9290(01)00034-3 Han, 1991, Analysis of the internal mechanism of the spine in static and dynamic loading postures using optimization technique, 343 Marras, 2001, Female and male trunk geometry: size and prediction of the spine loading trunk muscles derived from MRI, Clin Biomech (Bristol, Avon), 16, 38, 10.1016/S0268-0033(00)00046-2 Alexander, 1970, New dimensions in legal and ethical concepts for human research. 2. Special problems of medical disciplines. Psychiatry: methods and processes for investigation of drugs, Ann N Y Acad Sci, 169, 344, 10.1111/j.1749-6632.1970.tb54741.x Brand, 1981, Relative tension and potential excursion of muscles in the forearm and hand, J Hand Surg [Am], 6, 209, 10.1016/S0363-5023(81)80072-X An, 1989, Physiological considerations of muscle force through the elbow joint, J Biomech, 22, 1249, 10.1016/0021-9290(89)90227-3 Haxton, 1944, Absolute muscle force in the ankle flexors of man, J Physiol, 103, 267, 10.1113/jphysiol.1944.sp004075 Ikai, 1968, Calculation of muscle strength per unit cross-sectional area of human muscle by means of ultrasonic measurement, Int Z Angew Physiol, 26, 26 Kaufman, 1991, Physiological prediction of muscle forces—I. Theoretical formulation, Neuroscience, 40, 781, 10.1016/0306-4522(91)90012-D Pearcy, 1988, Instantaneous axes of rotation of the lumbar intervertebral joints, Spine (Phila Pa 1976), 13, 1033, 10.1097/00007632-198809000-00011 Lin, 1992, Lumbar lordosis: normal adults, J Formos Med Assoc, 91, 329 Papadakis, 2010, The association of spinal osteoarthritis with lumbar lordosis, BMC Musculoskelet Disord, 11, 1, 10.1186/1471-2474-11-1 Cholewicki, 1991, Lumbar spine loads during the lifting of extremely heavy weights, Med Sci Sports Exerc, 23, 1179, 10.1249/00005768-199110000-00012 Nachemson, 1981, Disc pressure measurements, Spine, 6, 93, 10.1097/00007632-198101000-00020 Chambers, 2010, The effect of obesity and gender on body segment parameters in older adults, Clin Biomech (Bristol, Avon), 10.1016/j.clinbiomech.2009.10.015 Dennison, 2008, Ex vivo measurement of lumbar intervertebral disc pressure using fibre-Bragg gratings, J Biomech, 41, 221, 10.1016/j.jbiomech.2007.07.015 McNally, 1992, Internal intervertebral disc mechanics as revealed by stress profilometry, Spine (Phila Pa 1976), 17, 66, 10.1097/00007632-199201000-00011 Nachemson, 1960, Lumbar intradiscal pressure. Experimental studies on post-mortem material, Acta Orthop Scand Suppl, 43, 1, 10.3109/ort.1960.31.suppl-43.01 Rohlmann, 2009, Applying a follower load delivers realistic results for simulating standing, J Biomech, 42, 1520, 10.1016/j.jbiomech.2009.03.048 Meakin, 2008, The effect of axial load on the sagittal plane curvature of the upright human spine in vivo, J Biomech, 41, 2850, 10.1016/j.jbiomech.2008.06.035