Effect of the Physiological Angular Position of the Resting Knee on Pressure at the Heel/Surface Interface

The angle of knee flexion during resting, supine position is measured by a first person.

The angle of knee flexion during resting, supine position is measured by a second person.

"The pressure analysis system used is the X Sensor X3 model (Xsensor Technology Corporation, Calgary, Canada). The sensor mat is made up of transducer cells, each measuring 1.6 cm\^2. The digital signal is transmitted to a PC via a USB port at a sampling frequency of 10Hz. Before each measurement, the sensor mat is calibrated from 10 to 220 mm Hg, according to the manufacturer's recommendations.~The sheet of pressure sensors is disposed on the dedicated bed. The patient is then asked to take his/her usual position in the supine position and a latency of 5 minutes is observed. The recording time pressure is then performed for 90 seconds in the optical observing time to adapt to changes in media."