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Open Access Research

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

Nachiappan Chockalingam13*, Surendra Bandi3, Aziz Rahmatalla3, Peter H Dangerfield12 and El-Nasri Ahmed13

Author Affiliations

1 Faculty of Health, Staffordshire University, Stoke on Trent, ST4 2DF, UK

2 Departments of Clinical Anatomy and Cell Biology and Musculo Skeletal Medicine, University of Liverpool, Liverpool, L69 3GE, UK

3 Hartshill Orthopaedic Unit, University Hospital of North Staffordshire, Stoke on Trent, ST4 6QG, UK

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Scoliosis 2008, 3:10  doi:10.1186/1748-7161-3-10

Published: 12 August 2008

Abstract

Background Context

Research 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.

Purpose

To 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 sample

Nine 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 measures

Kinetic 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.

Methods

The 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.

Results

Results 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.

Conclusion

Although further longitudinal studies are needed, results indicate that the variables identified in this study are applicable to initial screening and surgical evaluation of scoliosis.