Abstract: An implant apparatus (1, 100, 200) has a distal component (10, 101, 201) with a stem for intramedullary insertion in a distal bone such as the metacarpal. A proximal component is for sliding engagement on the trapezium as is known in the art. The apparatus also has a replacement proximal component (30, 110, 210) which can be releasably connected to the distal component by threads (23, 15, 104, 115, 204, 215) so that it may replace the original proximal component during revision surgery to provide a different manner of hemi arthroplasty articulation on a proximal bone. For example, after a trapeziectomy, the replacement may extend as far proximally as the scaphoid bone for translational movement on this bone, whereas the original proximal component engaged a surface of the trapezium with translational movement.

Abstract: Provided herein is a composite material for use in orthopaedic applications, and an orthopaedic implant made from such material, the composite material comprising a polymeric matrix material and further comprising a filler material comprising TiO2 and reduced graphene oxide. Also provided herein is a cranial prosthesis comprising a peripheral frame portion defining an aperture, and a removable insert portion for closing the aperture. Further provided is a cranial prosthesis comprising a core layer and a first skin layer, the first skin layer having a lower porosity than the core layer. The medical materials and devices disclosed herein may provide improved materials for use in orthopaedic applications, prostheses which offer improved access for revision surgery, and prostheses which offer improved bone integration and mechanical properties.

Abstract: Described is an articulating intervertebral disc prosthesis including a first member having a vertebra engaging portion and a bearing surface; a second member having a vertebra engaging portion and a bearing surface, which in use abuts the first member bearing surface to form a first bearing joint, —and motion restraint means adapted to provide ax-ticulation restraint of the bearing joints at predetermined limits of articulation similar to the natural motion restraint of a facet joint; wherein the prosthesis is longitudinally—split into two bodies so that the two bodies can be laterally separated, each body having an articulating bearing joint. Preferably, the second member bearing surface is shaped to include at least a portion of a first substantially circular curve when viewed in a first section, and at least a portion of a second substantially circular curve when viewed in a second section, said first and second curves being of respectively different sizes of circle.

Abstract: Described is an articulating intervertebral disc prosthesis including a first member having a vertebra engaging portion and a bearing surface; a second member having a vertebra engaging portion and a bearing surface, which in use abuts the first member bearing surface to form a first bearing joint, —and motion restraint means adapted to provide ax-ticulation restraint of the bearing joints at predetermined limits of articulation similar to the natural motion restraint of a facet joint; wherein the prosthesis is longitudinally-split into two bodies so that the two bodies can be laterally separated, each body having an articulating bearing joint. Preferably, the second member bearing surface is shaped to include at least a portion of a first substantially circular curve when viewed in a first section, and at least a portion of a second substantially circular curve when viewed in a second section, said first and second curves being of respectively different sizes of circle.