TIBIAL PROSTHESIS (VERSIONS) Russian patent published in 2016 - IPC A61F2/38 

FIELD: medicine.

SUBSTANCE: group of inventions relates to medicine. A tibial prosthesis according to the first version comprises a distal surface, a proximal surface and a peripheral surface. The proximal surface is opposite to said distal surface. Said proximal surface has a lateral compartment and a medial compartment. A peripheral wall passes between said distal and proximal surfaces. Said peripheral wall forms an anterior edge, a lateral posterior edge, a medial posterior edge, a lateral periphery and a medial periphery. The lateral posterior edge is wholly opposite to said anterior edge and forms the posterior boundary of said lateral compartment. The medial posterior edge is wholly opposite to said anterior edge and forms the posterior boundary of said medial compartment. The lateral periphery extends from said anterior edge to said lateral posterior edge. Said lateral periphery forms a plurality of adjacent lateral arcs. An adjacent pair of said plurality of adjacent lateral arcs forms a first lateral radius and a second lateral radius, respectively. Said first lateral radius is greater than said second lateral radius by at least 100%. The medial periphery extends from said anterior edge to said medial posterior edge. Said medial periphery forms a plurality of adjacent medial arcs. An adjacent pair of said plurality of adjacent medial arcs forms a first medial radius and a second medial radius, respectively. Said first medial radius is greater than said second medial radius by at least 75%. A tibial prosthesis according to the second version comprises a proximal surface and a peripheral surface. The proximal surface is opposite to said distal surface. A peripheral wall passes between said distal and proximal surfaces. Said peripheral wall forms an anterior edge, a lateral periphery and a medial periphery. The lateral periphery comprises an anterior edge, a medial-lateral corner and a posterior-lateral corner. The lateral edge forms a substantially perpendicular tangent relative to said anterior edge. The anterior-lateral corner forms an angular sweep between said anterior edge and said lateral edge so as to determine the length of the edge of the anterior-lateral corner. The posterior-lateral corner extends in the direction from said lateral edge and said anterior-lateral corner. The medial periphery comprises a medial edge, an anterior-medial corner and a posterior-medial corner. The medial edge forms a substantially perpendicular tangent relative to said anterior edge. The anterior-medial corner forms an angular sweep between said anterior edge and said medial edge so as to determine the length of the edge of the anterior-medial corner, which is greater than the length of the edge of the anterior-lateral corner. The angular sweep between said anterior edge and said medial edge is similar to the angular sweep between said anterior edge and said lateral edge. The posterior-medial corner extends in the direction from said medial edge and said anterior-medial corner. The tibial prosthesis according to the third version comprises an asymmetrical prosthesis periphery. Said periphery comprises an anterior-posterior axis, an anterior edge, a lateral edge, a medial posterior edge, a lateral periphery, a medial periphery and a medial-lateral axis (A_ML). The anterior-posterior axis divides said prosthesis periphery into a medial compartment and a lateral compartment. The anterior edge is located between said medial compartment and said lateral compartment. The lateral posterior edge is wholly opposite to said anterior edge and forms the posterior boundary of said lateral compartment. The medial posterior edge is wholly opposite to said anterior edge and forms the posterior boundary of said medial compartment. The lateral periphery extends from said anterior edge to said lateral posterior edge. Said lateral periphery forms an anterior-lateral arc and a lateral arc. The anterior-lateral arc has an anterior-lateral arc centre (C2L). The lateral arc has a lateral arc centre (C3L). Said lateral arc forms a tangent (212A), which is parallel to said anterior-posterior axis. The medial periphery extends from said anterior edge to said medial posterior edge. Said medial periphery forms an anterior-medial arc and a medial arc. The anterior-medial arc has an anterior-medial arc centre (C1R). The medial arc has a medial arc centre (C2R), wherein said medial arc forms a tangent which is parallel to said anterior-posterior axis. The medial-lateral axis (A_ML) forms the longest line segment, bounded by said prosthesis periphery, which is also perpendicular to said anterior-posterior axis. Said anterior-lateral arc centre is located between said medial-lateral axis and said anterior edge. Said anterior-medial arc centre is located behind said medial-lateral axis.

EFFECT: invention is aimed at providing suitable sizes for different bone sizes of patients and implantation in a specific, suitable orientation in order to ensure desirable performance of the prosthesis.

23 cl, 6 tbl, 16 dwg