Characterization of Fingertips Using MRI Images (FINGERS-COMPRESSION)

Study Overview
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Brief Summary
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The objectives was to obtain MRI images of the index finger of the subjects without loading and with loadings (normal and shear forces from 1 to 4N).

Official Title
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Characterization of Fingertips Using MRI Images : Development of Mechanically Faithful Models Dedicated to Manipulation.

Conditions
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Healthy

Intervention / Treatment
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* Other: Compression of the fingertip under MRI.


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Active voluntary healthy adult aged 18 to 65, affiliated to a social security scheme Stature between 170 and 179cm Body mass index (BMI) between 20 and 25 No previous hand musculoskeletal disorders Cognitive level compatible with oral communication, adherence to instructions and understanding of gestures Having signed the consent to participate in the study Exclusion Criteria: the subject presents a neurological or orthopedic disorder ; the subject presents a pathology that could disturb the task ; the subject has an Magnetic Resonance Imaging (MRI) contraindication (wears a pacemaker, insulin pump, prothesis, etc, has claustrophobia, …)

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 65 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Basic Science
Allocation: Non-Randomized
Intervention Model: Parallel Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Group no manual work or activity<br>Subject with an office or student job. | Other: Compression of the fingertip under MRI.<br>* Compression of the fingertip by a static loading on the phalanx distal of the index of the subjects; Then also a shear stress in the transverse direction of the finger. The data provided by the MRI images will be geometric information such as the thickness of the skin and its possible variation as a function of the area of the finger, the total thickness of soft tissues in compression as a function of the variation in l The angle between the axis of the phalanx and the plane of contact; Mechanical type information relating to the displacements and reaction forces, to the internal deformations of the different areas of the finger.<br>|
| Sham Comparator: Group manual work<br>Subject working in a manual or predominantly manual. | Other: Compression of the fingertip under MRI.<br>* Compression of the fingertip by a static loading on the phalanx distal of the index of the subjects; Then also a shear stress in the transverse direction of the finger. The data provided by the MRI images will be geometric information such as the thickness of the skin and its possible variation as a function of the area of the finger, the total thickness of soft tissues in compression as a function of the variation in l The angle between the axis of the phalanx and the plane of contact; Mechanical type information relating to the displacements and reaction forces, to the internal deformations of the different areas of the finger.<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Average fingertip deflection under compression | The different stresses will be: compression of the fingertip by a static loading on the phalanx distal of the index of the subjects; Then also a shear stress in the transverse direction of the finger. | Day 1 | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Average fingertip dimensions | In order to develop realistic biomechanical models of the fingers allowing the simulation of the grip, an essential step will be the experimental mechanical characterization of the distal phalanges. | Day 1 | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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MRI, fingers compression