PMID: 9167810May 1, 1997Paper

Impact loading of the lumbar spine during football blocking

The American Journal of Sports Medicine
C J GattJ P Zawadsky

Abstract

The purpose of our study was to determine the impact force to the lumbar spine when football players hit a blocking sled. We quantified the loads at the L4-5 motion segment throughout the blocking sequence. Five Division I-A college football linemen were subjects for our study. Kinematic data were obtained while the subjects hit a blocking sled instrumented with a force plate. Three plane forces were then calculated from these data. The average impact force measured at the blocking sled was 3013 +/- 598 N. The average peak compression force at the L4-5 motion segment was 8679 +/- 1965 N. The average peak anteroposterior shear force was 3304 +/- 1116 N, and the average peak lateral shear force was 1709 +/- 411 N. The magnitude of the loads on the L4-5 motion segment during football blocking exceed those determined during fatigue studies to cause pathologic changes in both the lumbar disk and the pars interarticularis. These data suggest that the mechanics of repetitive blocking may be responsible for the increased incidence of lumbar spine injury incurred by football linemen.

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Citations

Jan 6, 2007·European Spine Journal : Official Publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society·Christoph J SiepeH Michael Mayer
Aug 21, 2012·Sports Biomechanics·Young-Tae LimWoen-Sik Chae
Feb 16, 2008·Sports Medicine and Arthroscopy Review·Najeeb KhanMichael Haak
Sep 8, 2010·Clinical Journal of Sport Medicine : Official Journal of the Canadian Academy of Sport Medicine·Jason W Savage, Wellington K Hsu
Dec 2, 2006·British Journal of Sports Medicine·Bernard H CastinelChristophe Prat
Feb 6, 2014·Sports Medicine·Daniel Travis McMasterMichael McGuigan
Jun 5, 2012·Clinics in Sports Medicine·Konstantinos M TriantafillouS Babak Kalantar
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Feb 27, 2016·The Journal of Manual & Manipulative Therapy·Mitchell Selhorst, Brittany Selhorst
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Dec 17, 2015·International Journal for Numerical Methods in Biomedical Engineering·Romane BlanchardChristian Hellmich
Jul 12, 2013·The American Journal of Sports Medicine·Masaki NagashimaMorio Matsumoto
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Feb 7, 2020·Medicine and Science in Sports and Exercise·Alexa SchyverMaryse Fortin
May 31, 2021·Clinics in Sports Medicine·Paul R GauseEdward J Dohring

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