Stephen J. Edmondston1,2,3,4,5, Andrij Ferguson6,7, Patrick Ippersiel1,2,3,4,5, Lars Ronningen1,2,3,4,5, Stig Sodeland1,2,3,4,5, Luke Barclay8
1 Senior Lecturer, School of Dentistry & Health Sciences, Charles Sturt University, New South Wales, Australia.
2Deakin University
3Deakin University's Figshare
4Edith Cowan University, 270 Joondalup Drive, Joondalup, Western Australia, 6027, Australia
5the Radiation Safety Committee and the Human Research Ethics Committee of Curtin University, Perth, Western Australia, Australia
6Foundation Professor of Physiotherapy, School of Exercise and Health Sciences, Edith Cowan University, Joondalup, Western Australia, Australia.
7Master of Manipulative Therapy Graduate, School of Physiotherapy, Curtin University, Perth, Western Australia, Australia.
8science
Tóm tắt
Study Design Single-cohort laboratory-based study. Objectives To measure thoracic spine extension motion during bilateral arm elevation using functional radiography and photographic image analysis. Background Impairment of thoracic spine extension motion may impact shoulder girdle function. Motion of the thoracic spine during arm movement has not been directly measured using functional radiographic analysis. Methods In 21 asymptomatic men, thoracic kyphosis was measured in neutral standing and in end-range bilateral arm elevation, using lateral radiographs and photographic image analysis. Using both measurement techniques, the difference in thoracic kyphosis between the 2 body positions was used to quantify the range of extension motion of the thoracic spine. Bland-Altman plots were used to examine the agreement between measurement techniques. The relationship between the amount of thoracic kyphosis in neutral standing and kyphosis in full bilateral arm elevation was also examined. Results The mean ± SD increase in thoracic extension with bilateral arm elevation was 12.8° ± 7.6° and 10.5° ± 4.4°, when measured from the radiographs and photographs, respectively. There was a significant correlation between the radiographic and photographic measurements of the amount of thoracic kyphosis measured in neutral posture (r = 0.71, P<.01) and for the kyphosis measured in full bilateral arm elevation (r = 0.79, P<.001). The mean difference between the 2 measurement techniques was 2.1° for kyphosis measured in neutral posture and 0.5° when measured in full bilateral arm elevation. The thoracic kyphosis angle measured in neutral posture was strongly correlated with the thoracic kyphosis angle measured in full bilateral arm elevation when measured with both radiographic (r = 0.80, P<.001) and photographic (r = 0.84, P<.001) techniques. Conclusion In asymptomatic men, bilateral arm elevation is associated with movement of the thoracic spine toward extension, but the amount of movement is variable among individuals. J Orthop Sports Phys Ther 2012;42(10):861–869, Epub 20 April 2012. doi:10.2519/jospt.2012.4164
