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Clinical assessment of thoracic axial rotation: a criterion-related validity study of a digital inclinometer and iPhone Bucke B1, Spencer S1, Fawcett L1, Sonvico L2, Rushton A3, Heneghan N3 1) Lilleshall EIS, 2) Milton Keynes EIS 3) University of Birmingham Introduction Aims Spinal axial rotation is required for functional & sporting activities, with the thoracic spine contributing 80% (Fuji et al., 2007). Limited thoracic mobility may impair functional performance or predispose individuals to injury in anatomically related regions (lumbar, cervical spine or shoulder) (Heneghan and Rushton, 2016). Existing measures of spinal axial rotation commonly involve technical equipment and include lumbar motion (Johnson et al., 2012). To investigate the validity of DI (Acumar®) & iPhone (‘Clinometer®’ app) to measure thoracic spine rotation Results DI (r=0.882) & iPhone (r=0.875) demonstrated ‘strong’ criterion validity. Bland-Altman plots illustrate mean differences between the DI and iPhone to the reference standard of 5.82o (CI=14.55o) and 4.94o (CI=14.29o) respectively. Design/Methods Validity study Convenience sample n=23 (M=14, F=9). Mean (SD) age (±4.28) years. Digital inclinometer (DI) & iPhone measures were compared to the reference standard: motion analysis with US imaging (Heneghan et al. 2009). Measurements were taken concurrently with the DI, iPhone and reference standard over the C7/T1 Measurements were taken across a number of positions from neutral, mid- & end-range rotation (Figure 1 & 2) The mean of 3 measures were used for data analysis. Clinical Implications DI & iPhone provide a valid measure of thoracic spine rotation in the heel-sit position. Supports use of heel-sit position as a clinical test for thoracic spine dysfunction or assessment of range of movement. Key References Heneghan N, Rushton A. Understanding why the thoracic region is the ‘Cinderella’ region of the spine. Man Ther. 2016;21: Johnson K. et al Reliability of thoracic spine rotation range-of-motion measurements in healthy adults. J Athl Train. 2012;47(1):52-60. Figure 2: Left rotation position Figure 1: Heel-sit start position
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