REGISTRATION OF INTRAMEDULLARY CANAL DURING REVISION TOTAL KNEE ARTHROPLASTY
Methods and systems for identifying and determining the size and orientation of a reamed portion of a patient's bone are disclosed. A tracking array and/or point probe may be inserted into an adapter device. The adapter device comprising a plurality of openings, having various connection means therein, such that when the tracking array is inserted into the adapter, a secure and robust connection is created. A reamer, stem, or similar tool may then be inserted into the opposing side of the adapter, during which, a secure and robust connection is created between the adapter and the tool. Thus, through the use of Computer Assisted Surgery Systems, a more accurate representation of the patient's anatomy can be obtained.
1 . A method for aligning a femoral implant device within a reamed portion of an intramedullary canal of a femur, the method comprising:
providing a femoral implant device comprising a femoral load bearing component, an intramedullary stem, and an offset component;
determining an offset factor based on an axis of the reamed portion of the intramedullary canal of the femur;
optimizing an alignment of the femoral load bearing component relative to the intramedullary stem with an offset component, wherein the offset component comprises an elongated first end portion and an elongated second end portion opposite the first end portion, wherein an axis of the first end portion is offset from an axis of elongation of the second end portion in order to adjust an alignment of the femoral implant by the offset factor; and
displaying the optimized alignment of the femoral load bearing component.
2 . The method of claim 1 , wherein determining the offset factor comprises measuring at least one of an offset distance and an offset angle relative to the axis of the reamed portion of the intramedullary canal.
3 . The method of claim 1 , further comprising attaching the femoral load bearing component to the first end portion via a first connection interface.
4 . The method of claim 1 , further comprising attaching the intramedullary stem to the second end portion via a second connection interface.
5 . The method of claim 4 , wherein the intramedullary stem comprises an attachment point, and wherein the method further comprises interchangeably affixing the attachment point to the second connection interface and a tracking array.
6 . The method of claim 1 , further comprising connecting the tracking array to the intramedullary stem via a quick connect mechanism.
7 . The method of claim 6 , wherein the tracking array comprises a point probe, and wherein the method further comprises interchangeably connecting the point probe to the quick connect mechanism.
8 . The method of claim 1 , wherein the first end portion and the second end portion of the offset component are integrally formed, and wherein the method further comprises forming the offset component as a single piece.
9 . The method of claim 1 , wherein the intramedullary stem is integrally formed with the second end portion of the offset component, and wherein the method further comprises forming the intramedullary stem and the offset component as a single piece.
10 . The method of claim 1 , further comprising customizing the offset component to be patient-specific based on the determined offset factor.
11 . The method of claim 1 , wherein determining the offset factor based on the axis of the reamed portion of the intramedullary canal of the femur comprises capturing, via a tracking array affixed to a reamer within the reamed portion of the intramedullary canal, the axis.
12 . A system for aligning a femoral implant device within a reamed portion of an intramedullary canal of a femur, the system comprising:
the femoral implant device comprising a femoral load bearing component, an intramedullary stem, and an offset component, wherein the offset component comprises an elongated first end portion and an elongated second end portion opposite the first end portion, wherein an axis of the first end portion is offset from an axis of elongation of the second end portion in order to adjust an alignment of the femoral implant by the offset factor;
one or more processing units;
one or more memories in communication with the processing units and storing computer executable instructions which, when executed, cause the one or more processing units to:
determine an offset factor based on an axis of the reamed portion of the intramedullary canal of the femur; and
optimize an alignment of the femoral load bearing component relative to the intramedullary stem with an offset component.
13 . The system of claim 12 , further comprising
an effector platform controllable by the one or more processors to implant the femoral implant at least partially within the reamed portion of the intramedullary canal of the femur.
14 . The system of claim 12 , wherein determining the offset factor comprises measuring at least one of an offset distance and an offset angle relative to the axis of the reamed portion of the intramedullary canal.
15 . The system of claim 12 , wherein the offset component is customized to be patient-specific based on the determined offset factor.
16 . The system of claim 12 , wherein the first end portion and the second end portion of the offset component are integrally formed as a single piece and wherein the intramedullary stem is integrally formed with the second end portion of the offset component as a single piece.
17 . A computer assisted surgical system, comprising
a femoral implant device comprising a femoral load bearing component, an intramedullary stem, and an offset component, wherein the offset component comprises an elongated first end portion and an elongated second end portion opposite the first end portion, wherein an axis of the first end portion is offset from an axis of elongation of the second end portion in order to adjust an alignment of the femoral implant by the offset factor;
a tracking system;
an effector platform; and
a surgical computer in communication with the tracking system and the effector platform, wherein the surgical computer is configured to:
determine an offset factor based on an axis of the reamed portion of the intramedullary canal of the femur; and
optimize an alignment of the femoral load bearing component relative to the intramedullary stem with an offset component.
18 . The computer assisted surgical system of claim 17 wherein the effector platform is controllable by the surgical computer to implant the femoral implant at least partially within the reamed portion of the intramedullary canal of the femur.
19 . The computer assisted surgical system of claim 17 wherein determining the offset factor comprises measuring at least one of an offset distance and an offset angle relative to the axis of the reamed portion of the intramedullary canal.
20 . The computer assisted surgical system of claim 17 wherein the offset component is customized to be patient-specific based on the determined offset factor, wherein the first end portion and the second end portion of the offset component are integrally formed as a single piece and wherein the intramedullary stem is integrally formed with the second end portion of the offset component as a single piece.