Cervical spine posteroanterior stiffness differs with neck position |
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| Authors: | Suzanne J Snodgrass Haley R Rhodes |
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| Institution: | 1. Department of Mechanical Engineering, Sharif University of Technology, Tehran, Iran;2. Division of Applied Mechanics, Department of Mechanical Engineering, École Polytechnique, Montréal, Québec, Canada;1. Infectious diseases Laboratory, YRG Centre for AIDS Research and Education (YRG CARE), Voluntary Health Services Hospital Campus, Taramani, Chennai, India (PN, HSI, SS, MS, EC, SS, PB), Johns Hopkins School of Medicine, Baltimore (SSS), Johns Hopkins School of Public Health, Baltimore, USA 21205 (SM);1. Division of Endocrinology and Diabetes, The Children’s Hospital of Philadelphia, 34th and Civic Center Boulevard, Philadelphia, PA 19104, USA;2. Department of Biostatistics and Epidemiology, Perelman School of Medicine, University of Pennsylvania, 610 Blockley Hall, 423 Guardian Drive, Philadelphia, PA 19104-6021, USA;3. Division of Nephrology, The Children’s Hospital of Philadelphia, Perelman School of Medicine, University of Pennsylvania, 34th and Civic Center Boulevard, Philadelphia, PA 19104, USA;4. Division of Endocrinology and Diabetes, The Children’s Hospital of Philadelphia, University of Pennsylvania School of Nursing, 34th and Civic Center Boulevard, Philadelphia, PA 19104, USA;5. Division of Endocrinology and Diabetes, The Children’s Hospital of Philadelphia, Perelman School of Medicine, University of Pennsylvania, 34th and Civic Center Boulevard, Philadelphia, PA 19104, USA;6. Division of Endocrinology and Diabetes, The Children’s Hospital of Philadelphia, University of Pennsylvania School of Nursing, 418 Curie Boulevard, Philadelphia, PA 19104, USA |
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| Abstract: | PurposeSpinal stiffness is commonly considered when treating patients with neck pain, but there are few studies reporting the objective measurement of cervical spine stiffness or the possible kinesiological factors that may affect its quantification. The aim of this study was to determine if the position of the neck affects cervical spine stiffness.MethodsAn instrumented stiffness assessment device measured posteroanterior cervical spine stiffness at C4 of 25 prone-lying asymptomatic subjects in three neck positions in randomised order: maximal flexion, maximal extension, and neutral. The device applied five standardised mechanical oscillatory pressures while measuring the applied force and concurrent displacement, defining stiffness as the slope of the linear portion of the force–displacement curve. Repeated measures analysis of variance with Bonferroni-adjusted post hoc comparisons determined whether stiffness differed between neck positions.ResultsThere was a significant difference in cervical spine stiffness between different neck positions (F(1.6,38.0) = 16.6, P < 0.001). Stiffness was least in extension with a mean of 3.09 N/mm (95% CI 2.59, 3.58) followed by neutral (3.94, 95% CI 3.49, 4.39), and then flexion (4.32, 95% CI 3.96, 4.69).ConclusionWhen assessing cervical spine stiffness, neck position should be standardised to ensure maximal reliability and utility of stiffness judgments. |
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