I'd like to use elastic elements to apply forces and torques to joints of an upper arm model in order to restraint joint kinematics but i couldn´t find a clue on MSMS manual about how to do it....
Can you please try using a dummy mass (zero mass) element at a remote point close to the joint where you can apply the required load / torque and connecting the mass node (master node) to the nodes (slave nodes) of the elements to which the load / torque is to be transmited/ applied?