A device for measuring knee torque during static voluntary or stimulated contraction in bedridden humans, for performing measurements on a knee of a leg of a human placed in supine position, wherein the device comprises: - a base plate, which is arranged to be positioned under the patient's hips in the supine position, wherein further elements and their orientation are defined with respect to an orientation of the device in which the base plate is horizontally oriented; - fixation means connected to the base plate for fixation of the device to the patient hips for ensuring reliable measurements; - a mechanical dynamometer framework, comprising: ∘ a long element attached at a first end to one side of the base plate, such that the long element extends away from the base plate, ∘ two shorter elements (4,5) connected to the longer element at the second end of the longer element,, wherein the first shorter element is on one end slidably and rotatably mounted on the longer horizontal element and the second shorter element is rotatably mounted the other end of the first shorter element, wherein the long element is arranged to be placed on the outer side of the tested leg; - a torque sensor installed at the junction of the two shorter elements (4,5); - a brace for fixation of the shin, located at the free end of the second shorter element; - a fixation belt for the knee, located at the junction of the short elements (4,5); - a cylindrical element for knee support, located at the junction of the short elements (4,5); - a main electronic unit for processing data sent from the torque sensor. - a base plate, which is arranged to be positioned under the patient's hips in the supine position, wherein further elements and their orientation are defined with respect to an orientation of the device in which the base plate is horizontally oriented; - fixation means connected to the base plate for fixation of the device to the patient hips for ensuring reliable measurements; - a mechanical dynamometer framework, comprising: ∘ a long element attached at a first end to one side of the base plate, such that the long element extends away from the base plate, ∘ two shorter elements (4,5) connected to the longer element at the second end of the longer element,, wherein the first shorter element is on one end slidably and rotatably mounted on the longer horizontal element and the second shorter element is rotatably mounted the other end of the first shorter element, wherein the long element is arranged to be placed on the outer side of the tested leg; ∘ a long element attached at a first end to one side of the base plate, such that the long element extends away from the base plate, ∘ two shorter elements (4,5) connected to the longer element at the second end of the longer element,, wherein the first shorter element is on one end slidably and rotatably mounted on the longer horizontal element and the second shorter element is rotatably mounted the other end of the first shorter element, - a torque sensor installed at the junction of the two shorter elements (4,5); - a brace for fixation of the shin, located at the free end of the second shorter element; - a fixation belt for the knee, located at the junction of the short elements (4,5); - a cylindrical element for knee support, located at the junction of the short elements (4,5); - a main electronic unit for processing data sent from the torque sensor.