Reaction moment at the L5/S1 joint during simulated forward slipping with a handheld load

Jian Liu, Thurmon Lockhart, Sukwon Kim

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


The purpose of the study was to investigate the effects of load on the net moment response at the L5/S1 joint during simulated slip events. Six young individuals were instructed to take one step with a handheld load. Sudden floor movement was randomly introduced to simulate unexpected slips. Different loads conditions (0%, 10%, 20%, 30% of body weight) were introduced at random. Three-dimensional net moments at the L5/S1 joint were computed via downward inverse dynamic model. Peak joint moment generated at 30% load level was found to be significantly higher compared to no-load condition. No peak moment differences were found among no-load, 10% or 20% load levels. Additionally, the findings from this study indicated a flexiondominant net L5/S1 joint moment pattern during motion phase associated with slip-induced falls.

Original languageEnglish (US)
Pages (from-to)429-436
Number of pages8
JournalInternational Journal of Occupational Safety and Ergonomics
Issue number3
StatePublished - 2014
Externally publishedYes


  • Back injury
  • Load carrying
  • Reactive recovery
  • Slips and falls

ASJC Scopus subject areas

  • Safety, Risk, Reliability and Quality
  • Safety Research
  • Public Health, Environmental and Occupational Health


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