Knee arthroplasty method
AssigneeMarctec, LLC
InventorPeter M. Bonutti
Life of this patent
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Abstract
An improved method of performing surgery on a joint in a patient's body, such as a knee, includes making an incision in a knee portion of one leg while a lower portion of the one leg is extending downward from an upper portion of the one leg and while a foot connected with the lower portion of the one leg is below a support surface on which the patient is disposed. The incision is relatively short, for example, between seven and thirteen centimeters. A patella may be offset from its normal position with an inner side of the patella facing inward during cutting of a bone with a cutting tool. During cutting of the bone, one or more guide members having opposite ends which are spaced apart by a distance less than the width of an implant may be utilized to guide movement of a cutting tool.
Claims60
A method of performing a knee arthroplasty surgery on a knee portion of a leg of a patient through an incision, comprising:
- displacing a patella in the knee portion of the leg from a normal position to an offset position with the articulating surface of the patella facing the femur;
- positioning a cutting tool proximal to at least one of an upper or a lower portion of the leg and cutting at least a portion of the articulating surface of the femur while the patella is maintained offset from a normal position and not everted;
- moving at least one implant through the incision while the patella is offset from the normal position with the articulating surface of the patella facing the femur;
- and
- connecting the at least one implant with the cut portion of the articulating surface of the femur while the patella is offset from the normal position with the articulating surface of the patella facing the femur.
A method of performing a joint arthroplasty surgery on a leg of a patient through an incision in a knee portion of the leg, comprising:
- displacing a patella in the knee portion of the leg from a normal position to an offset position with an articulating surface of the patella facing the femur;
- positioning a guide assembly proximally to the patella, the guide assembly including a pair of substantially parallel arms and a slot having a guide surface configured for receiving a patella cutting tool;
- cutting the inner side of the patella, using the guide assembly, in the knee portion of the leg, prior to resecting the femur or the tibia, while the articulating surface of the patella faces towards a posterior portion of the knee portion of the leg, and includes removing at least a portion of the articulating surface of the patella;
- and
- connecting at least one patella implant to the cut articulating surface of the patella,
- wherein the cut articulating surface of the patella faces towards a posterior portion of the knee portion of the leg when the at least one patella implant is connected.
A method of performing a knee arthroplasty surgery on a leg of a patient through an incision in a knee portion of the leg, comprising:
- displacing a patella in the knee portion of the leg from a normal position to an offset position with an articulating surface of the patella facing the femur;
- positioning a cutting tool proximal to at least one of an upper or a lower portion of the leg;
- cutting the articulating surface of the patella in the knee portion of the leg, wherein the articulating surface of the patella faces the femur and includes removing at least a portion of the articulating surface of the patella;
- cutting at least one of the articulating surface of the femur or tibia in preparation for an implant component to replace the cut articulating surface;
- and
- positioning a patella implant component on the cut articulating surface of the patella,
- wherein the articulating surface of the patella is cut prior to displacing the patella from the normal position to the offset position and wherein the articulating surface of the patella faces the femur during positioning of the patella implant.
A method of performing a knee arthroplasty surgery on a leg of a patient through an incision in a knee portion of the leg, comprising:
- displacing a patella in the knee portion of the leg from a normal position to an offset position with an articulating surface of the patella facing the femur;
- positioning a cutting tool proximal to at least one of an upper or a lower portion of the leg;
- cutting at least a portion of the articulating surface of the patella while the patella is in an offset position with the articulating surface of the patella facing the femur;
- positioning the implant component on the cut articulating surface of the patella with the cut articulating surface of the patella facing the femur;
- and
- supporting the patient with the lower portion of the leg suspended from the upper portion of the leg, wherein the lower portion remains suspended from the upper portion while the patella is moved to the offset position with the articulating surface of the patella facing the femur.
A method of performing a knee arthroplasty surgery on a leg of a patient through an incision in a knee portion of the leg, comprising:
- displacing a patella in the knee portion of the leg from a normal position to an offset position with an articulating surface of the patella facing the femur;
- positioning a cutting tool proximal to at least one of an upper or a lower portion of the leg, and cutting articulating surface of the patella in preparation for an implant operative to replace the cut articulating surface, while the patella is in the offset position;
- moving a fluoroscope or magnetic resonance imaging unit (MRI) into a position to image a posterior portion of the knee portion of the leg of the patient;
- inspecting the posterior portion of the knee portion of the leg, including viewing the posterior portion of the knee portion with the fluoroscope or MRI;
- moving the leg of the patient between a flexed condition and an extended condition, wherein the posterior portion of the leg is viewed, at least partially, during movement of the leg of the patient between the flexed and extended conditions;
- and
- positioning the implant on the cut articulating surface of the patella with the cut articulating surface of the patella facing the femur.
A method of performing a knee arthroplasty surgery on a leg of a patient through an incision in a knee portion of the leg, comprising:
- displacing a patella in the knee portion of the leg from a normal position to an offset position with an articulating surface of the patella facing the femur;
- positioning a cutting tool proximal to at least one of an upper portion of the leg;
- and
- wherein displacing the patella from the normal position to the offset position comprises moving the patella laterally relative to the knee portion of the leg;
- cutting articulating surface bone of the femoral portion of the leg while maintaining the patella in the offset position with the articulating surface of the patella facing the femur;
- and
- connecting an implant to the cut articulating surface of the femur while maintaining the patella in the offset position with the articulating surface of the patella facing the femur.
A method of performing a knee arthroplasty surgery on a leg of a patient, comprising:
- making an incision in a knee portion of the leg of the patient having a length not more than a distance between, about the proximal end of the tibia to about the epicondylar notch on the distal end portion of the femur;
- displacing the patella from the normal position to an offset position with an articulating surface of the patella facing the femur;
- cutting at least a portion of the articulating surface of the patella, the patella being maintained in the offset position;
- cutting articulating bone surface of the femur or tibia in preparation for a replacement joint component;
- moving at least one patella implant through the incision while the patella is offset from the normal position with the articulating surface of the patella facing the femur;
- and
- connecting the at least one patella implant with the cut articulating surface of the patella in the offset position.
Dependencies are inferred from the claim text.