Tibial posterior slope alignment guide
A resection guide system for resecting an end of bone includes an anchoring block having an elongate shaft and an opening extending through the anchoring block at one end thereof. The opening is sized to receive a rod therein and defines an axis. A translation member includes a housing and a shaft extending therefrom. The housing is engageable to the shaft of the anchoring block in a first configuration in which the shaft of the translation member is oriented at a first angle relative to the axis of the opening and a second configuration in which the shaft of the translation member is oriented at a second angle relative to the axis of the opening. A resection guide assembly connects to the shaft of the translation member and has a resection guide surface adapted to guide a cutting instrument along a plane defined by the resection guide surface.
1. A resection guide system for resecting an end of bone, comprising:
an anchoring block having a head and an elongate shaft immovably fixed to the head, the head having an opening extending therethrough at one end thereof, the opening being sized to receive an intramedullary rod therein, the opening defining a longitudinal axis;
a translation member having a housing and a shaft monolithically formed with and extending from the housing, the housing of the translation member being engageable to the shaft of the anchoring block in a first configuration in which the shaft of the translation member is oriented at a first angle relative to the longitudinal axis of the opening and a second configuration in which the shaft of the translation member is oriented at a second angle relative to the longitudinal axis of the opening; and
a resection guide assembly connected to the shaft of the translation member and having a resection guide surface adapted to guide a cutting instrument along a plane defined by the resection guide surface.
2. The system of claim 1 , wherein the shaft of the anchoring block has a shaft axis that intersects the longitudinal axis of the opening at an obtuse angle.
3. The system of claim 2 , wherein the housing of the translation member has an opening extending therethrough from a first end to a second end thereof, the opening of the housing being configured to receive the shaft of the anchoring block.
4. The system of claim 3 , wherein the head has a cross-sectional dimension greater than the shaft and the opening extends through the head, and wherein in the first configuration the shaft of the anchoring block extends through the opening of the housing so that the first end of the housing faces the head of the anchoring block, and in the second configuration the shaft of the anchoring block extends through the opening of the translation member so that the second end of the housing faces the head of the anchoring block.
5. The system of claim 4 , wherein the shaft of the translation member is canted relative to the housing.
6. The system of claim 5 , wherein in the first configuration the shaft of the anchoring block is received in the opening of the housing so that the shaft of the translation member is canted toward the head of the anchoring block, and in the second configuration the shaft of the anchoring block is received in the opening of the housing so that the shaft of the translation member is canted away from the head of the anchoring block.
7. The system of claim 1 , wherein the first angle is 0 degrees such that the longitudinal axis is parallel to the shaft of the translation member, and the second angle is 3 degrees.
8. The system of claim 7 , wherein the plane defined by the resection guide surface is perpendicular to a shaft axis of the translation member.
9. A resection guide system for resecting an end of a tibia, comprising:
an anchoring block having a shaft and opening extending through the shaft at an end thereof, the opening being configured to receive an IM rod extending from the tibia;
a translation member having a housing and a shaft extending from the housing; and
a resection guide assembly having a resection guide surface, the resection guide assembly being connectable to the shaft of the translation member,
wherein the housing of the translation member is configured to connect to the anchoring block in a first configuration such that the resection guide surface of the resection guide assembly is positioned in a first orientation relative to the tibia when the IM rod is received within the opening and in a second configuration such that the resection guide surface of the resection guide assembly is positioned in a second orientation relative to the tibia, and
wherein in the first configuration a first end of the housing faces the anchoring block, and in the second configuration a second end of the housing faces the anchoring block.
10. The system of claim 9 , wherein the housing defines an opening extending therethrough from the first end to the second end thereof, the opening defining a housing axis and being configured to receive the shaft of the anchoring block.
11. The system of claim 10 , wherein the shaft of the translation member is canted relative to the housing such that a shaft axis of the translation member intersects the housing axis at an oblique angle.
12. The system of claim 11 , wherein the anchoring block includes a head at an end thereof, the head having a cross-sectional dimension greater than the shaft and the opening extending through the head, and wherein the shaft of the anchoring block is canted relative to the head such that a shaft axis of the anchoring block intersects a longitudinal axis of the opening of the head at an oblique angle.
13. The system of claim 9 , wherein the resection guide surface is perpendicular to the shaft of the translation member when the resection guide assembly is connected thereto.
14. A method of resecting a proximal tibia, comprising:
mounting an anchoring block onto an IM rod extending from the proximal tibia;
selecting one of a first and second posterior slope angle for application to the proximal tibia;
if the first posterior slope angle is selected, mounting a translation member carrying a resection guide assembly to the anchoring block in a first configuration such that a shaft of the anchoring block engages a housing of the translation member and a first end of the housing faces the tibia, the resection guide assembly having a resection guide surface disposed in a first orientation relative to the tibia;
if the second posterior slope angle is selected, mounting the translation member carrying the resection guide assembly to the anchoring block in a second configuration such that the shaft engages the housing and a second end of the housing faces the tibia, the resection guide surface being disposed in a second orientation relative to the tibia; and
resecting the tibia along the resection guide surface of the resection guide assembly.
15. The method of claim 14 , wherein in the second configuration a shaft of the translation member is canted away from the tibia, the resection guide assembly being connected to the shaft of the translation member.
16. The method of claim 14 , wherein mounting the anchoring block to the IM rod includes inserting the IM rod into an opening extending through a head of the anchoring block.
17. The method of claim 14 , wherein mounting the translation member to the anchoring block in the first configuration includes inserting the shaft of the anchoring block through an opening in the housing of the translation member from the first end of the housing to the second end of the housing.
18. The method of claim 17 , wherein mounting the translation member to the anchoring block in the second configuration includes inserting the shaft of the anchoring block through the opening in the housing of the translation member from the second end of the housing to the first end of the housing.