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The Dynamic Responses of the Cervical Spine: Buckling, End Conditions, and Tolerance in Compressive Impacts
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Abstract
This study explores the dynamics of head and cervical spine impact with the specific goals of determining the effects of head inertia and impact surface on injury risk. Head impact experiments were performed using unembalmed head and neck specimens from 22 cadavers. These included impacts onto compliant and a rigid surfaces with the surface oriented to produce both flexion and extension attitudes. Tests were conducted using a drop track system to produce impact velocities on the order of 3.2 m/s. Multiaxis transduction recorded the head impact forces, head accelerations, and the reactions at T1. The tests were also imaged at 1000 frames/sec.
Injuries occurred 2 to 30 msec following head impact and prior to significant head motion. Head motions were not found to correlate with injury classification. Decoupling was observed between the head and T1, resulting in a lag in the force histories. Cervical spine loading due to head rebound constituted up to 54±16 percent of the total axial neck load for padded impacts and up to 38±30 percent for the rigid impacts. Dynamic buckling was also observed; including first order modes and transient higher order modes which shifted the structure from a primarily compressive mode of deformation to various bending modes. The average load at failure was 2243±572 N for males and 1061 ± 273 N for females. The difference between male and female tolerance was significant p = 0.0015). Impacts onto the padded surfaces produced significantly larger neck impulses (p = 0.00023) and a significantly greater frequency of cervical spine injuries than rigid impacts (p = 0.043). The impact angle was also correlated with injury risk (p < 0.00001).
These experiments demonstrate that in the absence of head pocketing, the head mass can provide sufficient constraint to cause cervical spine injury. The buckling modes illustrate the kinematic complexity of cervical spine dynamics and may explain why injuries can occur at different vertebral levels and with widely varying mechanism in compressive head impacts. These experiments also suggest that highly deformable padded contact surfaces should be employed carefully in environments where there is the risk for cervical spine injury; however, the orientation of the head, neck, and torso relative to the impact surface is of greater significance.
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Authors
Citation
Nightingale, R., McElhaney, J., Camacho, D., Kleinberger, M. et al., "The Dynamic Responses of the Cervical Spine: Buckling, End Conditions, and Tolerance in Compressive Impacts," SAE Technical Paper 973344, 1997, https://doi.org/10.4271/973344.Also In
References
- McElhaney J. H. Myers B. S. Biomechanical aspects of cervical trauma Naham A. M. Melvin J. W. Accidental Injury 311 361 Springer-Verlag New York 1993
- Miller T. R. Douglass J. B. Galbraith M. S. Lestina D. C. Pindus N. M. Costs of head and neck injury and a benefit-cost analysis of bicycle helmets Levine R. S. Head and Neck Injury 211 240 Society of Automotive Engineering New York 1994
- Huelke D. F. Moffat E.A. Mendelsohn R.A. Melvin J.W. Cervical fractures and fracture dislocations - an overview Proceedings of the 23rd Stapp Car Crash Conference 790131 462 468 1979
- Burke D. C. Burley H. T. Ungar G. H. Data on spinal injuries-part ii, outcome of the treatment of 352 consecutive admissions Aust N Z J Surg 55 4 377 82 Aug 1985
- Hadley M. N. Sonntag V. K. Grahm T. W. Masferrer R. Browner C. Axis fractures resulting from motor vehicle accidents, the need for occupant restraints Spine 11 9 861 4 Nov 1986
- Levine A. M. Edwards C. C. Fractures of the atlas Journal of Bone and Joint Surgery 73 5 680 691 1991
- Shapiro S. A. Management of unilateral locked facet of the cervical spine Neurosurgery 33 5 832 7 Nov 1993
- Alker G. J. Oh Y. S. Leslie E. V. Lehtotay J. Panaro V. A. Eschnev E.G. E. G. Post-mortem radiology of head and neck injuries in fatal traffic accidents Radiology 114 611 617 1975
- Bucholz R. W. Burkhead W. Z. Graham W. Petty C. Occult cervical spine injuries in fatal traffic accidents Journal of Trauma 19 10 768 771 1979
- Yoganandan N. Haffner M. Maiman D. J. Nichols H. Pintar Frank A. Jentzen J. Weinshel S. S. Larson S. J. Sances Anthony Epidemiology and injury biomechanics of motor vehicle related trauma to the human spine Proc. 33rd Stapp Car Crash Conference 1989
- Myers B. S. Winkelstein B. A. Epidemiology, classification, mechanism, and tolerance of human cervical spine injuries Crit. Rev. Biomed. Eng. 23 5&6 307 409 1995
- Bauze R.J. Ardran G. M. Experimental production of forward dislocation of the human cervical spine Journal of Bone and Joint Surgery 60-B 239 245 1978
- Hodgson V. R. Thomas L. M. Mechanisms of cervical spine injury during impact to the protected head Proceedings of the 24th Stapp Car Crash Conference 17 42 1980
- Nusholtz G. S. Huelke D.E. Lux P. Alem N. M. Montalvo F. Cervical spine injury mechanisms Proc. 27th Stapp Car Crash Conference 179 197 1983
- Alem N. M. Nusholtz G. S. Melvin J. W. Head and neck response to axial impacts Proceedings of the 28th Stapp Car Crash Conference 841667 275 288 1984
- Yoganandan N. Sances A. Jr. Maiman D. J. Myklebust J. B Pech P. Larson S. J. Experimental spinal injuries with vertical impact Spine 11 9 855 860 1986
- Myers B. S. McElhaney J. H. Richardson W. J. Nightingale R. W. Doherty B. J. The influence of end condition on human cevical spine injury mechanisms Proc. 35th Stapp Car Crash Conference 912915 391 399 1991
- Nightingale R. W. McElhaney J. H. Richardson W. J. Best T. M. Myers B. S. Experimental cervical spine injury: relating head motion, injury classification, and injury mechanism Journal of Bone Joint Surgery 78-A 3 412 421 1996
- Alem N.M. Nusholtz G.S. Melvin J.W. Superior-inferior head impact tolerance levels 1982
- Cavanaugh J. M. King A. I. Control of transmission of HIV and other bloodborne pathogens in biomechanical cadaveric testing Journal of Orthopaedic Research 8 159 166 1990
- Matsushita T. Sato T. B. Hirabayashi K. Fujimura S. Asazuma T. Takatori T. X-ray study of the human neck motion due to head inertia loading Proceedings of the '38th Stapp Car Crash Conference 942208 55 64 1994
- McElhaney J. H. Paver J. G. MeCrackin H. J. Maxwell G. M. Cervical spine compression responses Proc. 27th Stapp Car Crash Conference 831615 163 177 1983
- McElhaney J. H. States John D. Snyder R. G. Gabrielsen M. A. Biomechanical analysis of swimming pool injuries Society of Automotive Engineers 790137 47 53 1979
- Panjabi M. M. White 3d A. A. Johnson R. M. Cervical spine mechanics as a function of transection of components J Biomech 8 5 327 36 1975
- White A. A. III Panjabi M. M. Clinical Biomechanics of the Spine JB Lippincott Company Philadelphia 1990
- Nightingale R. W. McElhaney J. H. Richardson W. J. Myers B. S. Dynamic responses of the head and cervical spine to axial impact loading Journal of Biomechanics 29 3 307 318 1996
- Nusholtz G. S. Melvin J. W. Huelke D. F. Alem N. M. Blank J. G. Response of the cervical spine to superior-inferior head impact Proc. 25th Stapp Car Crash Conference 197 237 1981
- Pintar F. A. Sances A. Yoganandan N. Reinartz, J. Maiman D. J. Unger G. Cusick J. F. Larson S. J. Biodynamics of the total human cadaveric cervical spine Proc. 34th Stapp Car Crash Conference 902309 55 72 1990
- Foust D. R. Chaffin D. B. Snyder RG R. G. Baum J. K. Cervical range of motion and dynamic response and strength of cervical muscles Proceedings of the 17th Stapp Car Crash Conference 285 308 1971
- Schneider L. W. Foust D. R. Bowman B. M. Snyder R. G. Chaffin D. B. Abdelnovr T. A. Baum L. K. Biomechanical properties of the human neck in lateral flexion Proceedings of the 19th Stapp Car Crash Conference 3212 1975
- Babcock J. L. Cervical spine injuries, diagnosis and classification Arch Surg 111 6 646 51 June 1976
- Braakman R. Penning L. Causes of spinal lesions Injuries of the cervical spine Excerpta Medica, Amsterdam 1971
- Allen B. L. Ferguson R. L. Lehmann T. R. O'Brien R. P. A mechanistic classification of closed indirect fractures and dislocations of the lower cervical spine Spine 7 1 1 27 1982
- Huelke D. F. Nusholtz G. S. Cervical spine biomechanics: a review of the literature J Orthop Res. 4 2 232 45 1986
- Crisco J. J. Panjabi M. M. Euler stability of the ligamentous human lumbar spine Transactions of the 36th Annual Meeting of the ORS 15 607 1990
- Torg J. S. Pavlov H. Axial load teardrop fracture Athletic Injuries to the Head, Neck and Face Lea & Febiger Philadelphia 1991
- Torg J. S. Vegso O. J. J. Neill M. J. Sennett B. The epidemiologic, pathologic, biomechanical, and cinematographic analysis of football-induced cervical spine trauma Am J Sports Med 18 1 50 57 Jan 1990
- Pintar F. A. Yoganandan N. Pesigan M. Voo L. Cusick J.F. Maiman D.J. Sances A. Jr. Dynamic characteristics of the human cervical spine Proc. 39th Stapp Car Crash Conference 195 202 1995
- McElhaney J. H. Fogle J. L. Melvin J. W. Haynes R. R. Roberts V. L. Alem N. M. Mechanical properties on cranial bone J Biomech 3 5 495 511 Oct 1970
- Keaveny T. M. Hayes W. C. A 20-year perspective on the mechanical properties of trabecular bone J Biomech Eng 115 4B 534 42 Nov 1993