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Impact Attenuation of the Soft Pads and the Wearable Airbag for the Hip Protection in the Elderly

  • Youngjae Jeong
  • Soonjae Ahn
  • Jongman Kim
  • Seongjung Kim
  • Bummo Koo
  • Jeseong Ryu
  • Youngho KimEmail author
Regular Paper

Abstract

Hip fractures caused by the falls in the elderly can lead to serious injuries that diminish their quality of life. The soft pads and wearable airbag have been developed and commercialized to prevent hip fractures of the elderly. In this study, the hip impact simulator was developed and the impact forces of six types soft pads and the hip protection airbag were measured by using the hip impact simulator. In addition, the distribution of the impact force and maximum contact area were also measured by attaching the pressure sensor on the surrogate pelvis of the hip impact simulator. Experiments were performed depending on the conditions protecting the surrogate pelvis (unpadded, soft pad, airbag) and the fall from 20 to 40 cm heights were repeated three times depending on each condition. The hip protection airbag decreased the mean pressure applied on the hip joint by decreasing a peak impact force according to the increased maximum contact area compared to the unpadded and soft pad conditions at all fall heights. Therefore, it can be concluded that the hip protection airbag can prevent the hip fracture by effectively attenuating impact force during falls in the elderly.

Keywords

Fall Hip fracture Airbag Impact force 

Notes

Acknowledgements

This research was supported by The Leading Human Resource Training Program of Regional Neo industry through the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT(NRF-2016H1D5A1909760) and Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (NRF-2018R1D1A1B07048575).

References

  1. 1.
    Korea Consumer Agency. (2017). Analysis of elderly safety accident.Google Scholar
  2. 2.
    Hayes, W. C., Myers, E. R., Morris, J. N., Gerhart, T. N., Yett, H. S., & Lipsitz, L. A. (1993). Impact near the hip dominates fracture risk in elderly nursing home residents who fall. Calcified Tissue International, 52(3), 192–198.CrossRefGoogle Scholar
  3. 3.
    Ro, J., Kim, P., & Shin, C. (2018). Optimizing total hip replacement prosthesis design parameter for mechanical structural safety and mobility. International Journal of Precision Engineering and Manufacturing, 19(1), 119–127.CrossRefGoogle Scholar
  4. 4.
    Park, Y., Kim, J., Kim, Y., & Park, K. (2009). Osteonercrosis of femoral head after pelvic fracture: A case report. Journal of the Korean Orthopaedic Association, 44(4), 495–498.CrossRefGoogle Scholar
  5. 5.
    Johnell, O., & Kanis, J. A. (2006). An estimate of the worldwide prevalence and disability associated with osteoporotic fractures. Osteoporosis International, 17(12), 1726–1733.CrossRefGoogle Scholar
  6. 6.
    Sterling, D. A., O’Connor, J. A., & Bonadies, J. (2001). Geriatric falls: Injury severity is high and disproportionate to mechanism. The Journal of Trauma, 50(1), 116–119.CrossRefGoogle Scholar
  7. 7.
    Barnett, A., Smith, B., Lord, S. R., Williams, M., & Baumand, A. (2003). Community-based group exercise improves balance and reduces falls in at-risk older people: A randomised controlled trial. Age and Ageing, 32(4), 407–414.CrossRefGoogle Scholar
  8. 8.
    Robinovitch, S. N., Brumer, R., & Maurer, J. (2004). Effect of the ‘squat protective response’ on impact velocity during backward falls. Journal of Biomechanics, 37(9), 1329–1337.CrossRefGoogle Scholar
  9. 9.
    Bulat, T., Applegarth, S., Wilkinson, S., Fitzgerald, S. G., Ahmed, S., & Quigley, P. (2008). Effect of multiple impacts on protective properties of external hip protectors. Clinical Interventions in Aging, 3(3), 567–571.CrossRefGoogle Scholar
  10. 10.
    Laing, A. C., Feldman, F., Jalili, M., Tsai, C. M. J., & Robinovitch, S. N. (2011). The effects of pad geometry and material properties on the biomechanical effectiveness of 26 commercially available hip protectors. Journal of Biomechanics, 44(15), 2627–2635.CrossRefGoogle Scholar
  11. 11.
    van Schoor, N. M., Smit, J. H., Twisk, J. W. R., Bouter, L. M., & Lips, P. (2003). Prevention of hip fractures by external hip protectors: A randomized controlled trial. The Journal of the American Medical Association, 289(15), 1957–1962.CrossRefGoogle Scholar
  12. 12.
    O’Halloran, P. D., Cran, C. W., Beringer, T. R. O., Kernohan, G., O’Neill, C., Orr, J., et al. (2004). A cluster randomised controlled trial to evaluate a policy of making hip protectors available to residents of nursing homes. Age and Ageing, 33(6), 582–588.CrossRefGoogle Scholar
  13. 13.
    Birks, Y. F., Porthouse, J., Addie, C., Loughney, K., Saxon, L., Baverstock, M., et al. (2004). Randomized controlled trial of hip protectors among women living in the community. Osteoporosis International, 15(9), 701–706.CrossRefGoogle Scholar
  14. 14.
    van Schoor, N. M., van der Veen, A. J., Schaap, L. A., Smit, T. H., & Lips, P. (2006). Biomechanical comparison of hard and soft hip protectors, and the influence of soft tissue. Bone, 39(2), 401–407.CrossRefGoogle Scholar
  15. 15.
    Li, N., Tsushima, E., & Tsushima, H. (2013). Comparison of impact force attenuation by various combinations of hip protector and flooring material using a simplified fall-impact simulation device. Journal of Biomechanics, 46(6), 1140–1146.CrossRefGoogle Scholar
  16. 16.
    Parker, M. J., Gillespie, W. J., & Gillespie, L. D. (2006). Effectiveness of hip protectors for preventing hip fractures in elderly people: Systematic review. BMJ, 332(7541), 571–574.CrossRefGoogle Scholar
  17. 17.
    Korall, A. M. B., Feldman, F., Scott, V. J., Wasdell, M., Gillan, R., Ross, D., et al. (2015). Facilitators of and barriers to hip protector acceptance and adherence in long-term care facilities: A systematic review. Journal of the American Medical Directors Association, 16(3), 185–193.CrossRefGoogle Scholar
  18. 18.
    Derler, S., Spierings, A. B., & Schmitt, K. U. (2005). Anatomical hip model for the mechanical testing of hip protectors. Medical Engineering & Physics, 27(6), 475–485.CrossRefGoogle Scholar
  19. 19.
    Shi, G., Chan, C. S., Li, W. J., Leung, K. S., Zou, Y., & Jin, Y. (2009). Mobile human airbag system for fall protection using mems sensors and embedded SVM classifier. IEEE Sensors Journal, 9(5), 495–503.CrossRefGoogle Scholar
  20. 20.
    Tamura, T., Yoshimura, T., Sekine, M., Uchida, M., & Tanaka, O. (2009). A Wearable airbag to prevent fall injuries. IEEE Transactions on Information Technology in Biomedicine, 13(6), 910–914.CrossRefGoogle Scholar
  21. 21.
    Ahn, S., Choi, D., Kim, J., Kim, S., Jeong, Y., Jo, M., et al. (2018). Optimization of a pre-impact fall detection algorithm and development of hip protection airbag system. Sensors and Materials, 30(8), 1743–1752.CrossRefGoogle Scholar
  22. 22.
    SizeKorea. (2012). 6th Human body survey.Google Scholar
  23. 23.
    Robinovitch, S. N., Hayes, W. C., & McMahon, T. A. (1997). Distribution of contact force during impact to the hip. Annals of Biomedical Engineering, 25(3), 499–508.CrossRefGoogle Scholar
  24. 24.
    Laing, A. C., & Robinovitch, S. N. (2008). The force attenuation provided by hip protectors depends on impact velocity, pelvic size, and soft tissue stiffness. Journal of Biomechanical Engineering, 130(6), 061005.CrossRefGoogle Scholar
  25. 25.
    Bouxsein, M. L., Szulc, P., Munoz, F., Thrall, E., Sornay-Rendu, E., & Delmas, P. D. (2007). Contribution of trochanteric soft tissues to fall force estimates, the factor of risk, and prediction of hip fracture risk. Journal of Bone and Mineral Research, 22(6), 825–831.CrossRefGoogle Scholar
  26. 26.
    Robinovitch, S. N., Evans, S. L., Minns, J., Laing, C. A., Kannus, P., Cripton, P. A., et al. (2009). Hip protectors: Recommendations for biomechanical testing-an international consensus statement (part I). Osteoporosis International, 20(12), 1977–1988.CrossRefGoogle Scholar
  27. 27.
    Kang, K., Jung, Y., Tae, S., Lee, H., Jin, W., & Bae, Y. (1995). Roentgenographic study on shape and size of the femoral head of normal Korean adults. Journal of the Korean Orthopaedic Association, 30(3), 607–611.CrossRefGoogle Scholar
  28. 28.
    de Bakker, P. M., Manske, S. L., Ebacher, V., Oxland, T. R., Cripton, P. A., & Guy, P. (2009). During sideways falls proximal femur fractures initiate in the superolateral cortex: Evidence from high-speed video of simulated fractures. Journal of Biomechanics, 42(12), 1917–1925.CrossRefGoogle Scholar
  29. 29.
    Choi, W., Hoffer, J. A., & Robinovitch, S. N. (2010). The effect of positioning on the biomechanical performance of soft shell hip protectors. Journal of Biomechanics, 43(5), 818–825.CrossRefGoogle Scholar
  30. 30.
    Laing, A. C., & Robinovitch, S. N. (2008). Effect of soft shell hip protectors on pressure distribution to the hip during sideways falls. Osteoporosis International, 19(7), 1067–1075.CrossRefGoogle Scholar
  31. 31.
    Minns, R. J., Marsh, A. M., Chuck, A., & Todd, J. (2007). Are hip protectors correctly positioned in use? Age and Ageing, 36(2), 140–144.CrossRefGoogle Scholar
  32. 32.
    Song, S., Heo, M., Yu, C., Kim, K., & Kwon, T. (2018). Analysis of plantar pressure and muscular strength of daily activities with change of weight support. International Journal of Precision Engineering and Manufacturing, 19(8), 1219–1224.CrossRefGoogle Scholar
  33. 33.
    Choi, W., Hoffer, J. A., & Robinovitch, S. N. (2010). Effect of hip protectors, falling angle and body mass index on pressure distribution over the hip during simulated falls. Clinical Biomechanics, 25(1), 63–69.CrossRefGoogle Scholar

Copyright information

© Korean Society for Precision Engineering 2019

Authors and Affiliations

  • Youngjae Jeong
    • 1
  • Soonjae Ahn
    • 1
  • Jongman Kim
    • 1
  • Seongjung Kim
    • 1
  • Bummo Koo
    • 1
  • Jeseong Ryu
    • 2
  • Youngho Kim
    • 1
    Email author
  1. 1.Department of Biomedical EngineeringYonsei UniversityWonju-SiRepublic of Korea
  2. 2.DRAX Inc.Anyang-SiRepublic of Korea

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