Evaluation of Shoulder Stability During Forceful Arm Exertions
AbstractShoulder musculoskeletal disorders (MSDs) are a major cause of morbidity and pain in the modern working population. Epidemiological literature suggests that forceful arm exertions pose an increased risk for shoulder MSD development. The majority of shoulder MSDs involve the glenohumeral joint. The glenohumeral joint is characteristically unstable and stabilized by concavity compression mechanism. In this study a biomechanical model of shoulder complex was used to examine the concavity compression mechanism. Mechanical loading of the glenohumeral joint during forceful arm exertions was analyzed to quantify the angular position of the resultant muscle force vector in 3D space. The resultant muscle force vectors were almost always directed anteriorly, medially, and inferiorly, independent of the magnitude and the direction of the external force application. The knowledge gained in this study could possibly be used to quantify strain imposed on the shoulder muscles during forceful arm exertions.
Bureau of Labor Statistics. (2012). Nonfatal occupational injuries and illnesses requiring days away from work, 2011. Release no: USDL 12-2204, http://:www.bls.gov/news.release/pdf/osh2.pdf.
Chaffin, D., Andersson, G., & Martin, B. (2006). Occupational Biomechanics (4th ed.): Wiley-Interscience.
Cutlip, K., Nimbarte, A. D., & Moore, C. (2013). Stability of the Shoulder Complex During Manual Exertions. Paper presented at the XXV Annual Occupational Ergonomics and Safety Conference, Atlanta, GA.
da Costa, B. R., & Vieira, E. R. (2010). Risk factors for work-related musculoskeletal disorders: a systematic review of recent longitudinal studies. [Review]. American Journal of Industrial Medicine, 53(3), 285-323. doi: 10.1002/ajim.20750
Devereux, J., Vlachonikolis, I., & Buckle, P. (2002). Epidemiological study to investigate potential interaction between physical and psychosocial factors at work that may increase the risk of symptoms of musculoskeletal disorder of the neck and upper limb. Occupational and environmental medicine, 59(4), 269-277. doi: 10.1136/oem.59.4.269
Dubowsky, S. R., Rasmussen, J., Sisto, S. A., & Langrana, N. A. (2008). Validation of a musculoskeletal model of wheelchair propulsion and its application to minimizing shoulder joint forces. Journal of biomechanics, 41(14), 2981-2988.
Frankenfield, D. C., Rowe, W. A., Cooney, R. N., Smith, J. S., & Becker, D. (2001). Limits of body mass index to detect obesity and predict body composition. Nutrition, 17(1), 26-30. doi: 10.1016/S0899-9007(00)00471-8
Konrad, G., Jolly, J., Labriola, J., McMahon, P., & Debski, R. (2006). Thoracohumeral muscle activity alters glenohumeral joint biomechanics during active abduction. [Article]. Journal of Orthopaedic Research, 24(4), 748-756. doi: 10.1002/jor.20062
Larsson, B., Sogaard, K., & Rosendal, L. (2007). Work related neck-shoulder pain: a review on magnitude, risk factors, biochemical characteristics, clinical picture and preventive interventions. [Article]. Best Practice & Research in Clinical Rheumatology, 21(3), 447-463. doi: 10.1016/j.berh.2007.02.015
McCluskey, G., & Getz, B. (2000). Pathophysiology of anterior shoulder instability. [Article]. Journal of Athletic Training, 35(3), 268-272.
Nimbarte, A. D., Sun, Y., Jaridi, M., & Hsiao, H. (2013). Biomechanical loading of the shoulder complex and lumbosacral joints during dynamic cart pushing task. Applied ergonomics.
Rasmussen, J., Damsgaard, M., & Voigt, M. (2001). Muscle recruitment by the min/max criterion - a comparative numerical study. Journal of Biomechanics, 34(3), 409-415.
Silverstein, B., & Adams, D. (2007). Work-related Musculoskeletal Disorders of the Neck, Back, and Upper Extremity in Washington State, 1997-2005.
Staal, J., de Bie, R., & Hendriks, E. (2007). Aetiology and management of work-related upper extremity disorders. [Article]. Best Practice & Research in Clinical Rheumatology, 21(1), 123-133. doi: 10.1016/j.berh.2006.09.001
van Rijn, R. M., Huisstede, B. M., Koes, B. W., & Burdorf, A. (2010). Associations between work-related factors and specific disorders of the shoulder—a systematic review of the literature. Scandinavian journal of work, environment & health, 189-201.
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