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The CTD Risk is an ergonomic work analysis tool that is based on an analysis of the frequency of tasks of efforts, vibrations… for the upper body.


The Cumulative Trauma Disorder was developed through the study of operations in various sectors of production: agri-food, industry… It helps prevent MSD from upper limbs based on 200 000 hrs of work.

This method is based on quantitative data (frequencies, posture, force required…) to obtain a score to assess the level of trauma inflicted on the muscles and wrist tendons in particular.


Like most ergonomics methods, it’s best to always start by filming the tasks we want to evaluate. This is to facilitate the evaluation and the sharing of data.

The situation is assessed on four factors:

  • The frequency factor: calculated on the number of cycles performed, the duration of the work…
  • The posture Factor: Type of catches, shoulder abduction, back/neck angle…
  • The Force factor: Force Required for movement
  • Various other factors: use of gloves, vibrations…

Once each of the factors calculated, they are multiplied, divided… in order to obtain a final risk score.

Score that will serve as the basis of comparison between various actions, various ways of doing the same task…

The main interest lies in the fact that this analysis makes it easy to make comparisons between different ways of doing the operations. In the example below, the solutions identified reduce the exposure to ergonomic risks by 30%.

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