An implantable anatomical support includes a non-rectangular support body with a plurality of arms extending from the support body an interconnecting member that is coupled to each of the arms and an adjustable anchor slidably coupled to at least one of the interconnecting members to permit bi-directional movement along the interconnecting member and so configured to exert a compressive force generating frictional interference between the adjustable anchor and the interconnecting member to inhibit the bi-directional movement of the adjustable anchor along the interconnecting member unless sufficient force is applied to overcome the frictional interference.
