Ankle prosthesis

An ankle prosthesis (100) comprising a talar component (200) which includes a talar upper face (201) defining a first articular surface (202) and which extends between a talar anterior edge (203) and an opposite talar posterior edge (204) according to a first average direction (A-A′), said first articular surface (202) being curved according to said first average direction (A-A′), said first articular surface (202) comprising a first curved portion (202A) and a second curved portion (202B), each extending according to said first average direction (A-A′), said first curved portion (202A) having a first curvature and said second curved portion (202B) having a second curvature, said prosthesis (100),

• characterized in that said first curved portion (202A) and said second curved portion (202B) define respectively an anterior portion and a posterior portion of said first articular surface (202), said first curvature being greater than said second curvature;
• and further characterized in that said first (202A) and second (202B) curved portions of the first articular surface (202) defining first and second substantially frustoconical surface fractions, said first and second surface fractions being respectively derived from first and second fictional cones, having respectively first and second axes of rotation, said first and second surface fractions joining together in a contact plane inclined at an angle of between 10° and 30° towards said talar anterior edge (203) relative to a vertical plane containing said second axis of rotation, said contact plane containing said first and second axes of rotation.

An ankle prosthesis (100) comprising a talar component (200) which includes a talar upper face (201) defining a first articular surface (202) and which extends between a talar anterior edge (203) and an opposite talar posterior edge (204) according to a first average direction (A-A′), said first articular surface (202) being curved according to said first average direction (A-A′), said first articular surface (202) comprising a first curved portion (202A) and a second curved portion (202B), each extending according to said first average direction (A-A′), said first curved portion (202A) having a first curvature and said second curved portion (202B) having a second curvature, said prosthesis (100),

• characterized in that said first curved portion (202A) and said second curved portion (202B) define respectively an anterior portion and a posterior portion of said first articular surface (202), said first curvature being greater than said second curvature;
• and further characterized in that said first (0202A) and second (202B) curved portions of the first articular surface (202) defining first and second substantially frustoconical surface fractions, said first and second surface fractions being respectively derived from first and second fictional cones, having respectively first and second axes of rotation, said first and second surface fractions joining together in a contact plane inclined at an angle of about 20° towards said talar anterior edge (203) relative to a vertical plane containing said second axis of rotation, said contact plane containing said first and second axes of rotation.