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Biomechanical loading of shoulder joints during dynamic cart pushing tasks.

Sun-Y; Nimbarte-AD; Jaridi-M; Hsiao-H
Proceedings of the 62nd IIE Annual Conference and Expo, May 19 -23, 2012, Orlando, Florida. Lim G; Herrmann JW, eds. Norcross, GA: Institute of Industrial Engineers, 2012 May; :2899-2907
Manual handling of carts at workplaces are found to be associated with shoulder musculoskeletal disorders. It is currently unclear as to how the dynamic cart pushing tasks affect the musculoskeletal loading of shoulder complex joints. Therefore, the objective in this study was to evaluate dynamic pushing tasks to quantify their effects on the biomechanical loading of shoulder joints. Eight participants performed uphill cart pushing tasks on a flat, 5 degrees and 10 degrees ramped walkways at 20, 30, and 40 kg weight conditions. An optical motion analysis system configured with two force plates was used for data collection. The experimental data was modeled using a full-body musculoskeletal model to compute three-dimensional peak joint reaction forces acting at the sternoclavicular, acromioclavicular, and glenohumeral joints. The peak forces at the sternoclavicular joint were found to be relatively small (< 210 N) in all situations. The largest peak distraction, compression, and anterior-posterior shear forces acting at the glenohumeral joint were 1375 N, 856 N, and 619 N, respectively, during uphill pushing task on 10 degrees ramped walkway at 40 kg weight condition. Under the same conditions, the corresponding peak forces acting at the acromioclavicular joint were 909 N, 1103 N, and 740 N, respectively.
Musculoskeletal-system; Musculoskeletal-system-disorders; Manual-materials-handling; Materials-handling; Biomechanics; Body-regions; Body-burden; Overloading; Articulation; Quantitative-analysis; Biological-effects; Biomechanical-modeling; Task-performance; Force; Weight-factors; Humans; Author Keywords: Dynamic pushing; biomechanical loading; modeling; shoulder joints
Yun Sun, Keene State College, 229 Main Street, Keene, NH 03435-1901
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Conference/Symposia Proceedings
Lim-G; Herrmann-JW
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Proceedings of the 62nd IIE Annual Conference and Expo, May 19 -23, 2012, Orlando, Florida