Abstract: An apparatus and a method are provided for a patient-specific instrument guide for arthroplasty or other operations on bone tissue, capable of limiting bone cuts, achieving optimal implant positioning, and providing improved stability of implants. The patient-specific instrument guide comprises a body that includes a bone contact surface configured to contact a bone surface of a patient. The body is configured to be 3D printed according to medical imaging of a patient's anatomy, such that the bone contact surface optimally contacts the surface of the patient's bone. The body includes one or more guide slots that each slidably receives a cutting guide. The cutting guides are configured to receive a saw blade during bone cutting. The cutting guides may be oriented to guide cutting a talus or a tibia during a total ankle arthroplasty surgery.

Abstract: An implantable ankle-prosthesis component (1), comprising a main body (2) with a bone contact face (3) intended to come into contact with an area of a bone body of an ankle and extending along a median contact plane (Pc), and comprising a anchoring means (4) protruding from the bone contact face (3), the anchoring means (4) comprising two pairs (20A, 20B) of anchoring wings, each extending in a plane (P1, P2), respectively, orthogonal to said median contact plane (Pc) between a first end (23A, 23B) connected to said bone contact face (3) and an opposite second end (24A, 24B), the planes of extension (P1, P2) of the pairs (20A, 20B) of anchoring wings intersecting each other, said second ends (24A, 24B) of the pairs (20A, 20B) of anchoring wings being inscribed in a leading plane (Pa) inclined with respect to said median contact plane (Pc).

Abstract: The invention concerns 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, said first articular surface (202) being curved according to said first average direction, 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, said first curved portion (202A) having a first curvature and said second curved portion (202B) having a second curvature, said prosthesis (100) being 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.

Abstract: Improved ankle prosthesis. The invention concerns 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, said first articular surface (202) being curved according to said first average direction, 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, said first curved portion (202A) having a first curvature and said second curved portion (202B) having a second curvature, said prosthesis (100) being 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. Ankle prostheses.