Study Result – Impact of lumbar traction

Study of the impact of the lumbar traction of the Japet exoskeleton on the intervertebral disc.

The context 

The aim of this study is to measure the impact of the lumbar traction of the Japet.W exoskeleton on the intervertebral disc.

The approach

Two complementary studies have been carried out:

The first study consists of a predictive evaluation of the effect of the device using a validated numerical model. The intradiscal pressure of a model is simulated with and without exoskeleton. During the simulation with an exoskeleton, the exoskeleton provides a force of 4kg per engine.

Measurements are performed in the three anatomical planes for the three lower discs: L3L4, L4L5 and L5S1, which are the most frequently affected.

In order to validate the results obtained by simulation, the second study aims to measure on a cadaveric model, the effect of the Japet.W device on the intradiscal pressure.

A series of 5 measurements are carried out by activating the exoskeleton then deactivating it after 2 minutes.

The benefits

Numerical and cadaveric studies have shown a decrease in intradiscal pressures due to the application of a tensile force with the exoskeleton.


Relevance of a new external dynamic distraction device for treating back pain

Fahed Zairi1 , Mélissa Moulart2 , Christian Fontaine3 , Régis Logier4 , Vincent Tiffreau5 , Fahmi Zairi6

1 Department of neurosurgery, Hôpital Privé le Bois, Ramsay Général de santé, Lille France 2 Japet Medical Device, Lille France
3 Department of Anatomy, Lille University Hospital, Lille France
4 CIC-IT, Lille University Hospital, Lille France
5 Rehabilitation Unit, Lille University Hospital, Lille, France;
6 Lille University, Civil Engineering and geo-Environmental Laboratory (EA 4515 LGCgE), 59000 Lille, France


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