Pressure Patterns S2 | Scoliosis

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

Authors: Nachiappan Chockalingam, Surendra Bandi, Aziz Rahmatalla, Peter H Dangerfield and El-Nasri Ahmed

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, the 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.

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 indicate wide variations in the medio lateral direction CoP, which could be related to the laterality of both the main and compensation curves. This 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.

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.


Anonymous said…

I really enjoyed reading your blog. I have scoliosis and I enjoy reading about the back and scoliosis on blogs and other websites.. I am very pleased with the SpineCor brace that I started wearing since Nov 2004. I have hardly any back pain and there has been some improvement in my curve. It took a while but I got used to it and I appreciate the support it gives my back. A couple of people have told me that I look straighter now. I feel fortunate to have the opportunity to use the SpineCor brace. If you want more information on it go to . Anyways I look forward to all the updates. Thanks again.
Hi Jessica

Nice to hear from you and thanks for your comments. I will go and check the URL that you have given me. I hope to keep you occupied with my blog for now and the future.

Simone :)

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