Abstract: An electronic flexion transducer (10) comprises a helical coil formed from two interposed electrical conductors (A) and (B) which are electrically isolated from each other either by an insulated coating on the conductors or by being embedded in a dielectric material (11) having a substantial elasticity. The coil is bonded along one side over its entire length to a flexible non-extensible support surface (13) whereby flexion of the support surface causes a change in the length of the coil between said one side, which retains its original length, and a side opposite to said one side, which either increases or decreases in length. This relative change in length between opposite sides causes angular separation between adjacent turns of the coil and since adjacent turns represent respective conductors (A) and (B) there is a change in capacitance between the respective conductors which can be used to provide an electrical signal to a computer to record and display the change.