ASYMMETRIC TIBIAL COMPONENTS FOR A KNEE PROSTHESIS
First Claim
1. A family of tibial prostheses sized for attachment to a proximal tibia, the family comprising:
- a plurality of tibial prostheses defining a plurality of prosthesis peripheries, each said prosthesis periphery defining;
a centroid,an anteroposterior axis dividing said prosthesis periphery into a medial compartment and a lateral compartment;
a posterior-medial distance extending from said centroid to a posterior-medial corner of said prosthesis periphery;
a posterior-lateral distance extending from said centroid to a posterior-lateral corner of said prosthesis periphery;
said plurality of prosthesis peripheries including;
a small periphery corresponding to a small prosthesis size, said small periphery defining said posterior-medial distance having a small posterior-medial extent and said posterior-lateral distance having a small posterior-lateral extent;
a medium periphery corresponding a medium prosthesis size that is the next-largest consecutive prosthesis size as compared to said small prosthesis size, said medium periphery defining said posterior-medial distance having a medium posterior-medial extent larger than said small posterior-medial extent to exhibit a first posterior-medial growth, said medium periphery further defining said posterior-lateral distance having a medium posterior-lateral extent larger than said small posterior-lateral extent to exhibit a first posterior-lateral growth; and
a large periphery corresponding a large prosthesis size that is the next-largest consecutive prosthesis size as compared to said medium prosthesis size, said large periphery defining said posterior-medial distance having a large posterior-medial extent larger than said medium posterior-medial extent to exhibit a second posterior-medial growth, said large periphery further defining said posterior-lateral distance having a large posterior-lateral extent larger than said medium posterior-lateral extent to exhibit a second posterior-lateral growth,said second posterior-medial growth larger than said first posterior-medial growth, andsaid second posterior-lateral growth larger than said first posterior-lateral growth,whereby said plurality of tibial prostheses exhibit non-linear, asymmetric growth in medial and lateral posterior corners of said prosthesis peripheries as sizes of said tibial prostheses consecutively increase.
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Accused Products
Abstract
An orthopaedic tibial prosthesis includes a tibial baseplate with an asymmetric periphery which promotes proper positioning and orientation on a resected tibia, while also facilitating enhanced kinematics, soft-tissue interaction, and long-term fixation of the complete knee prosthesis. The asymmetric baseplate periphery is sized and shaped to substantially match portions of the periphery of a typical resected proximal tibial surface, such that proper location and orientation is evident by resting the baseplate on the tibia. The baseplate periphery provides strategically positioned relief and/or clearance between the baseplate periphery and bone periphery, such as in the posterior-medial portion to prevent deep-flexion component impingement, and in the anterior-lateral portion to avoid undue interaction between the anatomic iliotibial band and prosthesis components.
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Citations
43 Claims
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1. A family of tibial prostheses sized for attachment to a proximal tibia, the family comprising:
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a plurality of tibial prostheses defining a plurality of prosthesis peripheries, each said prosthesis periphery defining; a centroid, an anteroposterior axis dividing said prosthesis periphery into a medial compartment and a lateral compartment; a posterior-medial distance extending from said centroid to a posterior-medial corner of said prosthesis periphery; a posterior-lateral distance extending from said centroid to a posterior-lateral corner of said prosthesis periphery; said plurality of prosthesis peripheries including; a small periphery corresponding to a small prosthesis size, said small periphery defining said posterior-medial distance having a small posterior-medial extent and said posterior-lateral distance having a small posterior-lateral extent; a medium periphery corresponding a medium prosthesis size that is the next-largest consecutive prosthesis size as compared to said small prosthesis size, said medium periphery defining said posterior-medial distance having a medium posterior-medial extent larger than said small posterior-medial extent to exhibit a first posterior-medial growth, said medium periphery further defining said posterior-lateral distance having a medium posterior-lateral extent larger than said small posterior-lateral extent to exhibit a first posterior-lateral growth; and a large periphery corresponding a large prosthesis size that is the next-largest consecutive prosthesis size as compared to said medium prosthesis size, said large periphery defining said posterior-medial distance having a large posterior-medial extent larger than said medium posterior-medial extent to exhibit a second posterior-medial growth, said large periphery further defining said posterior-lateral distance having a large posterior-lateral extent larger than said medium posterior-lateral extent to exhibit a second posterior-lateral growth, said second posterior-medial growth larger than said first posterior-medial growth, and said second posterior-lateral growth larger than said first posterior-lateral growth, whereby said plurality of tibial prostheses exhibit non-linear, asymmetric growth in medial and lateral posterior corners of said prosthesis peripheries as sizes of said tibial prostheses consecutively increase. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A family of tibial prostheses sized for attachment to a proximal tibia, the family comprising:
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a plurality of tibial prostheses defining a plurality of prosthesis peripheries, each said prosthesis periphery defining; a centroid, an anteroposterior axis dividing said prosthesis periphery into a medial compartment and a lateral compartment; a posterior-medial distance extending from said centroid to a posterior-medial corner of said prosthesis periphery; a posterior-lateral distance extending from said centroid to a posterior-lateral corner of said prosthesis periphery; said plurality of prosthesis peripheries including; a small periphery defining said posterior-medial distance having a small posterior-medial extent and said posterior-lateral distance having a small posterior-lateral extent; and a large periphery defining said posterior-medial distance having a large posterior-medial extent larger than said large posterior-medial extent to exhibit a posterior-medial growth, said large periphery further defining said posterior-lateral distance having a large posterior-lateral extent larger than said small posterior-lateral extent to exhibit a posterior-lateral growth, said posterior-medial growth larger than said posterior-lateral growth, whereby said medial compartment grows faster than said lateral compartment in said large periphery as compared to said small periphery. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43)
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Specification