Assessment of the centre of pressure pattern and moments about S2 in scoliotic subjects during normal walking

Background ContextResearch employing gait measurements indicate asymmetries in ground reaction forces and suggest relationships between these asymmetries, neurological dysfunction and spinal deformity. Although, studies have documented the use of centre of pressure (CoP) and net joint moments in gait assessment and have assessed centre of mass (CoM)-CoP distance relationships in clinical conditions, there is a paucity of information relating to the moments about CoM. It is commonly considered that CoM is situated around S2 vertebra in normal upright posture and hence this study uses S2 vertebral prominence as reference point relative to CoM.PurposeTo assess and establish asymmetry in the CoP pattern and moments about S2 vertebral prominence during level walking and its relationship to spinal deformity in adolescents with scoliosis.Patient sampleNine Adolescent Idiopathic Scoliosis subjects (8 females and 1 male with varying curve magnitudes and laterality) scheduled for surgery within 2–3 days after data collection, took part in this study.Outcome measuresKinetic and Kinematic Gait assessment was performed with an aim to estimate the CoP displacement and the moments generated by the ground reaction force about the S2 vertebral prominence during left and right stance during normal walking.MethodsThe study employed a strain gauge force platform to estimate the medio-lateral and anterior-posterior displacement of COP and a six camera motion analysis system to track the reflective markers to assess the kinematics. The data were recorded simultaneously.ResultsResults indicate wide variations in the medio lateral direction CoP, which could be related to the laterality of both the main and compensation curves. This variation is not evident in the anterior-posterior direction. Similar results were recorded for moments about S2 vertebral prominence. Subjects with higher left compensation curve had greater displacement to the left.ConclusionAlthough further longitudinal studies are needed, results indicate that the variables identified in this study are applicable to initial screening and surgical evaluation of scoliosis.

[1]  Eiichi Uchiyama,et al.  An in vitro study of individual ankle muscle actions on the center of pressure. , 2003, Gait & posture.

[2]  Nachiappan Chockalingam,et al.  Assessment of ground reaction force during scoliotic gait , 2004, European Spine Journal.

[3]  M. Shinberg,et al.  Gait initiation in community-dwelling adults with Parkinson disease: comparison with older and younger adults without the disease. , 2002, Physical therapy.

[4]  P J Beek,et al.  Anticipatory postural adjustments before load pickup in a bi-manual whole body lifting task. , 1997, Medicine and science in sports and exercise.

[5]  David A. Winter,et al.  Human balance and posture control during standing and walking , 1995 .

[6]  Ramsay Sloss.  The effects of foot orthoses on the ground reaction forces during walking. Part 1 , 2001 .

[7]  F. Prince,et al.  Comparison of three methods to estimate the center of mass during balance assessment , 2004 .

[8]  A Karlsson,et al.  Correlations between force plate measures for assessment of balance. , 2000, Clinical biomechanics.

[9]  R. Brand,et al.  The biomechanics and motor control of human gait: Normal, elderly, and pathological , 1992 .

[10]  S. Katsuno,et al.  Changes with aging in head and center of foot pressure sway in children. , 1994, International journal of pediatric otorhinolaryngology.

[11]  J. Eng,et al.  Symmetry in vertical ground reaction force is accompanied by symmetry in temporal but not distance variables of gait in persons with stroke. , 2003, Gait & posture.

[12]  Neil Roberts,et al.  Research into Spinal Deformities 9 , 2021, Studies in Health Technology and Informatics.

[13]  Y. Itzchak,et al.  Analysis of muscular fatigue and foot stability during high-heeled gait. , 2002, Gait & posture.

[14]  Comments about the article titled: comparison of three methods to estimate the center of mass during balance assessment, written by D. Lafond, M. Duarte, F. Prince (37 (2004) 1421-1426). , 2005, Journal of biomechanics.

[15]  Heydar Sadeghi,et al.  Relations Between Standing Stability and Body Posture Parameters in Adolescent Idiopathic Scoliosis , 2002, Spine.

[16]  F. Prince,et al.  Comparison of three methods to estimate the center of mass during balance assessment. , 2004, Journal of biomechanics.

[17]  Paul D Sponseller,et al.  The etiology of adolescent idiopathic scoliosis. , 2002, American journal of orthopedics.

[18]  Warrick McKinon,et al.  The agreement between reaction-board measurements and kinematic estimation of adult male human whole body centre of mass location during running. , 2004, Physiological measurement.

[19]  H Hatze,et al.  Motion variability--its definition, quantification, and origin. , 1986, Journal of motor behavior.

[20]  Timothy M. Wright,et al.  Fundamentals of Orthopaedic Biomechanics , 1994 .

[21]  I. Stokes.  Three-dimensional terminology of spinal deformity. A report presented to the Scoliosis Research Society by the Scoliosis Research Society Working Group on 3-D terminology of spinal deformity. , 1994, Spine.

[22]  B. MacWilliams,et al.  Foot kinematics and kinetics during adolescent gait. , 2003, Gait & posture.

[23]  A. Kuo,et al.  Comparison of kinematic and kinetic methods for computing the vertical motion of the body center of mass during walking. , 2004, Human movement science.

[24]  Nachiappan Chockalingam,et al.  Do strain gauge force platforms need in situ correction? , 2002, Gait & posture.

[25]  I. Stokes.  Analysis of Symmetry of Vertebral Body Loading Consequent to Lateral Spinal Curvature , 1997, Spine.

[26]  D A Winter,et al.  Sampling duration effects on centre of pressure summary measures. , 2001, Gait & posture.

[27]  Manohar M. Panjabi,et al.  Clinical Biomechanics of the Spine , 1978 .

[28]  B. Nigg,et al.  Asymmetries in ground reaction force patterns in normal human gait. , 1989, Medicine and science in sports and exercise.

[29]  Scherer Pr,et al.  The center of pressure index in the evaluation of foot orthoses in shoes. , 1994, Clinics in podiatric medicine and surgery.

[30]  P. R. Scherer,et al.  Centre of pressure index in the evaluation of foot orthoses in shoes , 1994 .

[31]  A. Onell.  The vertical ground reaction force for analysis of balance? , 2000, Gait & posture.

[32]  E. Fuller,et al.  Center of pressure and its theoretical relationship to foot pathology. , 1999, Journal of the American Podiatric Medical Association.