Abstract: A medical device for applying pressure to a joint segment of a human body, a corresponding system and associated uses. The device includes at least three bearing units intended to be attached to a holder. Each bearing unit has: an extendable arm; a force-measuring element attached to the extendable arm; a movement-measuring element; a bearing element which is attached to the distal portion of the extendable arm, is adapted to be in contact with a part of the human body and makes it possible to apply the force measured by the force-measuring element to the part of the human body; and an attachment element adapted to attach the bearing unit to the support.