US 8,911,501 B2Granted

Cruciate-retaining tibial prosthesis

AssigneeMAKO Surgical Corp.

InventorsRonald R. Irwin, Jason Karl Otto, Ali Zafar Abbasi, Mark Ellsworth Nadzadi

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Abstract

A tibial prosthesis comprises a medial base portion configured to engage a medial surface of a tibia and a lateral base portion configured to engage a lateral surface of the tibia. At least a portion of the medial and lateral base portions are separated by a passage interposed therebetween. The tibial prosthesis also comprises a bridge coupling the medial base portion and the lateral base portion, wherein at least a portion of the bridge is elevated above a portion of the passage between the medial base portion and the lateral base portion. The bridge may define an underlying area that receives at least a portion of a tibial eminence when the tibial prosthesis is engaged with the tibia, wherein the height of the bridge varies in a superior direction across the passage.

Claims25

Dependent claims

A tibial prosthesis comprising:

a medial base portion configured to engage a medial surface of a tibia;
a lateral base portion configured to engage a lateral surface of the tibia, wherein at least a portion of the medial and lateral base portions are separated by a passage interposed therebetween;
and
a bridge coupling the medial base portion and the lateral base portion, wherein at least a portion of the bridge is elevated above a portion of the passage between the medial base portion and the lateral base portion, the bridge defining an underlying area that receives at least a portion of a tibial eminence when the tibial prosthesis is engaged with the tibia, wherein a height of the bridge varies in a superior direction across the passage;
and
wherein the medial base portion and the lateral base portion each comprise a lip formed along a respective mesial edge, wherein the lip increases in height from a posterior portion of the tibial prosthesis to an anterior portion of the tibial prosthesis, the bridge comprising a posterior edge defining a posterior opening, wherein the lips extend to the posterior edge and form, at least in part, the posterior opening, the lips providing support to allow the bridge to accommodate the at least a portion of the tibial eminence.

3 more elements

A tibial prosthesis comprising:

a medial base portion configured to engage a medial surface of a tibia and comprising a lip formed along a mesial edge of the medial base portion;
a medial insert portion configured to engage a recess formed in the medial base portion, the medial insert portion comprising a flange formed along a mesial edge of the medial insert portion in a direction substantially aligned with the mesial edge of the medial insert portion, such that when the medial insert portion engages the recess formed in the medial base portion, the flange is positioned adjacent to a distal surface of the lip and configured to protect at least a portion of the lip from contact by a femoral component;
a lateral base portion configured to engage a lateral surface of the tibia and comprising a lip formed along a mesial edge of the lateral base portion;
a lateral insert portion configured to engage a recess formed in the lateral base portion, the lateral insert portion comprising a flange formed along a mesial edge of the lateral insert portion in a direction substantially aligned with the mesial edge of the lateral insert portion, such that when the lateral insert portion engages the recess formed in the lateral base portion, the flange is positioned adjacent to a distal surface of the lip and configured to protect at least a portion of the lip from contact by a femoral component;
and
an arched bridge coupling the medial base portion and the lateral base portion, wherein at least a portion of the arched bridge is elevated above a portion of a passage interposed between the medial base portion and the lateral base portion, the arched bridge defining an underlying area that accommodates at least a portion of a tibial eminence when the tibial prosthesis is engaged with the tibia, wherein a width of the passage between the medial base portion and the lateral base portion increases from an anterior portion of the tibial prosthesis to a posterior portion of the tibial prosthesis.

3 more elements

Dependencies are inferred from the claim text.