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Figure 5. Trajectory of center of force on left axillary pad while using Easy Strutter Functional Orthosis System (ESFOS) or axillary crutches with or without hand support. Diamond, solid square, triangle, and square outlines are axillary crutches with hand support, axillary crutches without hand support, ESFOS with hand support, and ESFOS without hand support, respectively. Graph on right is close up of boxed area in figure on left. Points 1, 2, and 3 are times when maximum force occurs (2) and when 10% of maximum occurs (1 and 3). Borrelli J, Haslach HW Jr. Experimental characterization of axillary/underarm interface pressure in swing-through crutch walking. J Rehabil Res Dev. 2013;50(3):423–36. http://dx.doi.org/10.1682/JRRD.2012.01.0013 ResearcherID/ORCID: James Borrelli, PhD: C-7690-2011