Provisional tibial prosthesis system
First Claim
1. A provisional tibial prosthesis system for a prosthetic knee joint for implantation in a natural knee, the provisional tibial prosthesis system capable of alternatively mimicking the geometry of a first final tibial prosthesis and a second final tibial prosthesis, the natural knee comprising a proximal tibia and a distal femur and having a medial/lateral axis, an anterior/posterior axis, and a proximal/distal axis, the medial/lateral axis corresponding to a medial/lateral direction, the anterior/posterior axis corresponding to an anterior/posterior direction, and the proximal/distal axis corresponding to a proximal/distal direction, the provisional tibial prosthesis system comprising:
- a tibial base plate having a bone contacting surface and an opposing base plate superior surface;
a tibial bearing component having a tibial bearing component height, said tibial bearing component attachable to said tibial base plate, said tibial bearing component height representing the first final tibial prosthesis;
a shim having a shim height, said shim slidable relative to both said tibial base plate and said tibial bearing component to be slidably receivable between said tibial base plate and said tibial bearing component in the anterior/posterior direction when said tibial base plate and said tibial bearing component are separated by a distance along the proximal/distal axis equal to said shim height, said shim height cooperating with said tibial bearing component height to represent the second final tibial prosthesis; and
a base component attachable to said tibial bearing component, said base component positionable between said tibial bearing component and said tibial base plate, said shim slidably receivable between said tibial bearing component and said base component in the anterior/posterior direction when said base component and said tibial bearing component are separated by said distance along the proximal/distal axis equal to said shim height.
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Accused Products
Abstract
The present disclosure provides a provisional tibial prosthesis system for a set of prosthetic knee joints for implantation in a natural knee, the provisional tibial prosthesis system including a bearing component and a bearing support, the spacing of the bearing component from the bearing support is adjustable to allow for representation of a variety of different sized final tibial prostheses. In this system, only one provisional bearing component corresponding to each level of constraint is needed and shims are used to adjust the spacing of the bearing component from the bearing support. The shims are slidably insertable between the bearing component and the bearing support in an anterior/posterior direction to allow for adjustment of the spacing of the bearing component from the bearing support. The number of provisional components needed during knee surgery is reduced and adjustment of the system only requires the knee joint to be distracted by a distance equal to the height of a particular shim.
167 Citations
21 Claims
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1. A provisional tibial prosthesis system for a prosthetic knee joint for implantation in a natural knee, the provisional tibial prosthesis system capable of alternatively mimicking the geometry of a first final tibial prosthesis and a second final tibial prosthesis, the natural knee comprising a proximal tibia and a distal femur and having a medial/lateral axis, an anterior/posterior axis, and a proximal/distal axis, the medial/lateral axis corresponding to a medial/lateral direction, the anterior/posterior axis corresponding to an anterior/posterior direction, and the proximal/distal axis corresponding to a proximal/distal direction, the provisional tibial prosthesis system comprising:
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a tibial base plate having a bone contacting surface and an opposing base plate superior surface; a tibial bearing component having a tibial bearing component height, said tibial bearing component attachable to said tibial base plate, said tibial bearing component height representing the first final tibial prosthesis; a shim having a shim height, said shim slidable relative to both said tibial base plate and said tibial bearing component to be slidably receivable between said tibial base plate and said tibial bearing component in the anterior/posterior direction when said tibial base plate and said tibial bearing component are separated by a distance along the proximal/distal axis equal to said shim height, said shim height cooperating with said tibial bearing component height to represent the second final tibial prosthesis; and a base component attachable to said tibial bearing component, said base component positionable between said tibial bearing component and said tibial base plate, said shim slidably receivable between said tibial bearing component and said base component in the anterior/posterior direction when said base component and said tibial bearing component are separated by said distance along the proximal/distal axis equal to said shim height. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A provisional tibial prosthesis system for a prosthetic knee joint for implantation in a natural knee, the provisional tibial prosthesis system capable of alternatively mimicking the geometry of a first final tibial prosthesis, a second final tibial prosthesis, and a third final tibial prosthesis, the natural knee comprising a proximal tibia and a distal femur and having a medial/lateral axis, an anterior/posterior axis, and a proximal/distal axis, the medial/lateral axis corresponding to a medial/lateral direction, the anterior/posterior axis corresponding to an anterior/posterior direction, and the proximal/distal axis corresponding to a proximal/distal direction, the provisional tibial prosthesis system comprising:
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a tibial base plate having a bone contacting surface and an opposing base plate superior surface; a tibial bearing component having a tibial bearing component height, said tibial bearing component attachable to said tibial base plate, said tibial bearing component height representing the first final tibial prosthesis; a first shim having a first shim height, said first shim slidable relative to both said tibial base plate and said tibial bearing component to be slidably receivable between said tibial base plate and said tibial bearing component in the anterior/posterior direction when said tibial base plate and said tibial bearing component are separated by a first distance along the proximal/distal axis equal to said first shim height, said first shim height cooperating with said tibial bearing component height to represent the second final tibial prosthesis; and a second shim having a second shim height, said second shim slidable relative to both said tibial base plate and said tibial bearing component to be slidably receivable between said tibial base plate and said tibial bearing component in the anterior/posterior direction when said tibial base plate and said tibial bearing component are separated by a second distance along the proximal/distal axis equal to said first shim height and said second shim height, said first shim height and said second shim height cooperating with said tibial bearing component height to represent the third final tibial prosthesis. - View Dependent Claims (10, 11, 12, 13)
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14. A method of determining a size of a final tibial prosthesis for a prosthetic knee joint for implantation in a natural knee, the natural knee comprising a proximal tibia and a distal femur and having a medial/lateral axis, an anterior/posterior axis, and a proximal/distal axis, the medial/lateral axis corresponding to a medial/lateral direction, the anterior/posterior axis corresponding to an anterior/posterior direction, and the proximal/distal axis corresponding to a proximal/distal direction, the method comprising:
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selecting a provisional tibial prosthesis system, comprising; a tibial base plate having a bone contacting surface and an opposing base plate superior surface; a tibial bearing component having a tibial bearing component height, the tibial bearing component attachable to the tibial base plate; and a first shim having a first shim height, the first shim slidable relative to both the tibial base plate and the tibial bearing component to be slidably receivable between the tibial base plate and the tibial bearing component in the anterior/posterior direction when the tibial base plate and the tibial bearing component are separated by a first distance along the proximal/distal axis equal to the first shim height; resecting the proximal tibia to form a resected proximal tibia surface; positioning the bone contacting surface of the tibial base plate on the resected proximal tibia surface; positioning the tibial bearing component on the tibial base plate; spacing the tibial bearing component from the tibial base plate by sliding the first shim between the tibial base plate and the tibial bearing component in the anterior/posterior direction, without distracting the femur from the tibia a distance greater than the first shim height; performing range of motion testing to verify proper sizing of the provisional tibial prosthesis system; and when the testing indicates that the provisional tibial prosthesis system is not properly sized, removing the first shim from between the tibial base plate and the tibial bearing component in the anterior/posterior direction; selecting a second shim having a second shim height, the second shim slidable relative to both the tibial base plate and the tibial bearing component to be slidably receivable between the tibial base plate and the tibial bearing component in the anterior/posterior direction when the tibial base plate and the tibial bearing component are separated by a second distance along the proximal/distal axis equal to the second shim height, the second shim height different than the first shim height; and spacing the tibial bearing component from the tibial base plate by sliding the second shim between the tibial base plate and the tibial bearing component in the anterior/posterior direction, without distracting the femur from the tibia a distance greater than the second shim height. - View Dependent Claims (15, 16, 17, 18, 19)
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20. A method of determining a size of a final tibial prosthesis for a prosthetic knee joint for implantation in a natural knee, the natural knee comprising a proximal tibia and a distal femur and having a medial/lateral axis, an anterior/posterior axis, and a proximal/distal axis, the medial/lateral axis corresponding to a medial/lateral direction, the anterior/posterior axis corresponding to an anterior/posterior direction, and the proximal/distal axis corresponding to a proximal/distal direction, the method comprising:
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selecting a provisional tibial prosthesis system, comprising; a tibial base plate having a bone contacting surface and an opposing base plate superior surface; a tibial bearing component having a tibial bearing component height, the tibial bearing component attachable to the tibial base plate; and a first shim having a first shim height, the first shim slidable relative to both the tibial base plate and the tibial bearing component to be slidably receivable between the tibial base plate and the tibial bearing component in the anterior/posterior direction when the tibial base plate and the tibial bearing component are separated by a first distance along the proximal/distal axis equal to the first shim height; resecting the proximal tibia to form a resected proximal tibia surface; positioning the bone contacting surface of the tibial base plate on the resected proximal tibia surface; positioning the tibial bearing component on the tibial base plate; spacing the tibial bearing component from the tibial base plate by sliding the first shim between the tibial base plate and the tibial bearing component in the anterior/posterior direction, without distracting the femur from the tibia a distance greater than the first shim height; and performing range of motion testing to verify proper sizing of the provisional tibial prosthesis system; and when the testing indicates that the provisional tibial prosthesis system is not properly sized, selecting a second shim having a second shim height, the second shim slidable relative to both the tibial base plate and the tibial bearing component to be slidably receivable between the tibial base plate and the tibial bearing component in the anterior/posterior direction when the tibial base plate and the tibial bearing component are separated by a second distance along the proximal/distal axis equal to the first shim height and the second shim height; and spacing the tibial bearing component from the tibial base plate by sliding the second shim between the tibial base plate and the tibial bearing component in the anterior/posterior direction, without distracting the femur from the tibia a distance greater than the first shim height and the second shim height. - View Dependent Claims (21)
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Specification