I need a torque sensor that can measure the torque that is applied to a joint that moves according to the motion of your knee joint movement. Is there an inexpensive torque sensor that you recommend?
I would also like to know if there is good force sensor that you recommend that I can customize to use to measure torque with it.
The torque is due to forces applied by muscles and tendons internal to the leg, and is not possible to measure directly, without surgery. See this tutorial, which explains force and torque.