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PMHS Shoulder Stiffness Determined by Lateral and Oblique Impacts

Caupp, Sarah N
http://rave.ohiolink.edu/etdc/view?acc_num=osu1397649566

Abstract Details

2014, Master of Science, Ohio State University, Anatomy.
Data are desired that accurately represent the pediatric population for anthropomorphic test devices (ATD). Current pediatric ATDs are designed from scaled-down adult data, but their biofidelity is questioned. Because the use of pediatric cadavers is an ethical issue, different methods of testing are required to obtain data. This study will ultimately aid in leading to a more appropriate pediatric model of the shoulder. The data from this study will allow for (1) a comparison between adult volunteer and post mortem human subject (PMHS) quasi-static data, (2) a comparison between PMHS quasi-static and dynamic data, and (3) a comparison between dynamic lateral and oblique loading conditions. Side impacts of the PMHS were conducted in both quasi-static and dynamic manners. The impact was delivered in both purely lateral and oblique loading conditions for each test. With the application of a light load to the impacting shoulder in quasi-static testing, translational data were acquired from sensors fixed to the acromion processes and manubrium. Force data were also acquired. In dynamic testing, the PMHS was instrumented with a triaxial accelerometer block on each acromion process, the manubrium, and T1, strain gages placed on ribs 2–5 and the clavicles, and a chest band in the axillae. A 4.5 m/s impact was delivered through a pneumonic ram to one shoulder in the lateral loading condition while the opposing shoulder was impacted next at the same speed in the oblique loading condition. For all tests, the full girdle (acromion-to-acromion) deflection was calculated to determine overall deflection. A force-displacement plot was generated and stiffness values were calculated and were compared to previous studies. Injuries resulting from dynamic testing were included to demonstrate differences between lateral and oblique impacts. To date, quasi-static stiffness in the oblique direction, X-component (KX) and Y-component (KY), is very similar to adult volunteer data (KY = 10.3 ±1.2 N/mm compared to 7.0 N/mm; KX = 1.5 ± 0.8 N/mm compared to 1.6 N/mm). Dynamic oblique stiffness is much higher in the Y-component than the X-component (KY = 109.7 ± 57.3 N/mm compared to KX = 5.8 ± 1.0 N/mm). The oblique vector in both QS and dynamic testing displayed a lower force, higher displacement, and lower stiffness in the X-component compared to the Y-component. While comparing injuries after dynamic testing, it was difficult to make a correlation between the lateral and oblique loading condition at the selected impact speed.
John Bolte (Advisor)
126 p.
Anatomy and Physiology; Biomechanics; Biomedical Engineering
shoulder; side impact; PMHS; quasi-static testing; dynamic testing; lateral loading condition; oblique loading condition

Recommended Citations

Citations

  • Caupp, S. N. (2014). PMHS Shoulder Stiffness Determined by Lateral and Oblique Impacts [Master's thesis, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1397649566

    APA Style (7th edition)

  • Caupp, Sarah. PMHS Shoulder Stiffness Determined by Lateral and Oblique Impacts. 2014. Ohio State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1397649566.

    MLA Style (8th edition)

  • Caupp, Sarah. "PMHS Shoulder Stiffness Determined by Lateral and Oblique Impacts." Master's thesis, Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1397649566

    Chicago Manual of Style (17th edition)

osu1397649566
257
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This open access ETD is published by The Ohio State University and OhioLINK.