Knee osteoarthritis is a common cause of disability, affecting more than 650 million people aged 40 and over worldwide in 2020. To relieve pain and improve mobility, some patients use knee orthoses . However, the effectiveness of these devices is not universally agreed upon, and users report widely varying levels of satisfaction. This study aims to understand how the body responds to these orthoses from a biomechanical perspective, and in particular to quantify the interactions with soft tissues (skin, adipose tissue and muscles). To better understand this interaction, the authors propose to characterize soft tissue behavior on an individual basis using an indentation technique. In practice, this involves pressing on the soft tissues with an ultrasound probe to measure their stiffness at the interface between the leg and the orthosis.
Study Type
INTERVENTIONAL
Allocation
NA
Purpose
BASIC_SCIENCE
Masking
NONE
Enrollment
20
we push the soft tissue in the indentation zone with an instrumented elastographic probe, allowing to assess force vs tissue thickness.
Ens Rennes
Bruz, Ille-et-Vilaine, France
force-displacement curves
Using the force below and displacement below, this a construction of the relative displacement with regard to the applied force
Time frame: through study completion, an average of 1 year
Indentation force (N)
Force being applied by the indenter on the zone to be indented
Time frame: through study completion, an average of 1 year
Displacement (mm)
using motion capture, this is the assessment of the relative displacement of the probe with regard to the resting position during an indentation
Time frame: through study completion, an average of 1 year
Height (m)
Height of the subject, measured with a standard ruler
Time frame: through study completion, an average of 1 year
Weight (kg)
measured with a standard scale
Time frame: through study completion, an average of 1 year
Muscle activity (mV)
from the main flexors and extensors of the thigh, using EMGs
Time frame: through study completion, an average of 1 year
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