An implantable lead anchor includes a first anchor shell having a first hinge element and a second anchor shell, disposed opposite the first anchor shell, having a second hinge element. The first and second anchor shells define a lead channel and the first and second hinge elements form a hinge. The lead anchor includes at least one tensioning element that is configured and arranged to increase in tension upon elongation. The first and second anchor shells, and the tensioning element provide an open position and a closed position. In the open position, a lead can be side loaded side loaded into the lead channel. In the closed position, the first and second anchor shells grip a portion of the lead disposed in the lead channel and, in combination with the at least one tensioning element, resist disengagement of the lead from the lead anchor.
