Metarsophalangeal joint replacement device and methods

A prosthetic metatarsophalangeal joint device comprising:

• a metatarsal bone anchor comprising a porous metallic material;
• a phalangeal bone anchor comprising a porous metallic material;
• and
• a polymeric spacer element connecting the metatarsal bone anchor and the phalangeal bone anchor, the polymeric spacer element comprising a plurality of elongate fibers extending between the metatarsal bone anchor and the phalangeal bone anchor and a polymeric matrix material interspersed with fibers of the plurality of elongate fibers,
• wherein:
• the metatarsal bone anchor is connected to a first end of the polymeric spacer element via a first interdigitation zone transitioning the porous metallic structure of the metatarsal bone anchor into the plurality of elongate fibers and polymeric matrix of the polymeric spacer element;
• the phalangeal bone anchor is connected to a second end of the polymeric spacer element via a second interdigitation zone transitioning the porous metallic structure of the phalangeal bone anchor into the plurality of elongate fibers and polymeric matrix of the polymeric spacer element;
• and
• the first and second interdigitation zones extend into pores of the metatarsal and phalangeal bone anchors and are free of fibers of the plurality of elongate fibers.