An implantable device, comprising: (a) a proximal anchor (200), configured to be implanted within a first metatarsal； said proximal anchor (200) has a collar (210) larger than the opening in said metatarsus in which said proximal anchor (200) is implanted； said collar (210) prevents cable-bone contact (b) a distal anchor (300), configured to be implanted within a second metatarsal, adjacent to said first metatarsal； said distal anchor has a male thread (330)； (c) a nut (350) that can be screwed onto said male thread (330) of the distal anchor (300)； (d) a chord (110) that mechanically interconnects said proximal and distal anchors (200, 300)； (e) a damper comprising an elongated housing (230) threadedly positioned within said proximal anchor (200)； wherein said damper houses a chord holder (245) mechanically connected to said housing (230) by a damper member (250)； characterized in that said chord holder (245) is freely rotatable within said housing (230) to prevent said cord (110) from twisting when said housing (230) is rotated to adjust a tension force.Un dispositivo implantable, que comprende: (a) un anclaje proximal (200), configurado para ser implantado dentro de un primer metatarso； dicho anclaje proximal (200) tiene un collarín (210) más grande que la abertura en dicho metatarso en la que se implanta dicho anclaje proximal (200)； dicho collarín (210) impide contacto cable-hueso (b) un anclaje distal (300), configurado para ser implantado dentro de un segundo metatarso, adyacente a dicho primer metatarso； dicho anclaje distal tiene una rosca macho (330)； (c) una tuerca (350) que se puede enroscar sobre dicha rosca macho (330) del anclaje distal (300)； (d) un cordón (110) que interconecta mecánicamente dichos anclajes proximal y distal (200, 300)； (e) un amortiguador que comprende un alojamiento alargado (230) colocado de manera roscada dentro de dicho anclaje proximal (200)； en donde dicho amortiguador alberga un portacordón (245) conectado mecánicamente a di
