The present invention relates to a process for controlled radical polymerization using an organosulfur reversible chain transfer agent which consists in preparing polymers having a molar weight of greater than 100 000 gmol, with a polydispersity index of less than 1. An instantaneous center of rotation of the rear stay member is defined at an intersection between an upper axis extending through first and second pivots of the upper link and a lower axis extending through third and fourth pivots of the lower link. The coil assembly includes multiple coil devices. The anchor has different versions which allow it to be attached to the tendon prior to insertion into the bone tunnel, or be inserted between tendon arms when the surgical procedure dictates. A permitted component driving torque is a difference between the actual engine torque and the required vehicle driving torque. In the most preferred embodiment, the reduction of the disulfide bond and the deprotection step is performed essentially simultaneously.