Device and method for bicompartmental arthroplasty

A method of performing bicompartmental arthroplasty of a patient's knee comprising the steps of:

• making an incision along the anterior medial aspect of the knee;
• excising the remnants of the medial meniscus;
• surgically preparing the medial compartment of a proximal end of the patient's tibia to receive a medial tibial prosthesis component in a manner so as to preserve the integrity of the anterior and posterior cruciate ligaments;
• said medial tibial prosthesis component having a first surface configured to be secured to said surgically prepared medial compartment of the proximal end of the tibia and a second concave curved surface;
• rotating the patella approximately 90 degrees;
• surgically preparing the medial compartment of a distal end of the patient's femur to receive a medial femoral prosthesis component having a concave trochlea surface;
• said medial femoral prosthesis component also having a first surface configured to be secured to said surgically prepared medial compartment of the distal end of the femur and a second convex curved surface configured to articulate with the second concave curved surface of said medial tibial prosthesis component to permit pivotal articulation between said medial femoral prosthesis component and said medial tibial prosthesis component, said pivotal articulation approximating the articulation of a healthy knee joint;
• securing the medial femoral component to the femur;
• securing the medial tibial component to the tibia;
• positioning the patella over the concave trochlea surface of the medial femoral prosthesis component;
• closing the incision.

A device for bicompartmental arthroplasty of the knee comprising:

• a medial femoral prosthesis component having a first leg portion and a second leg portion and a base portion connected between said first and second leg portions to form an essentially U shaped component, said medial femoral prosthesis component having a first interior surface configured to be secured to a surgically prepared medial compartment of a distal end of the patient's femur so that the base portion contacts the distal end of the femur, said first leg portion contacts an anterior surface of the distal end of the femur, and the second leg portion contacts a posterior surface of the distal end of the femur, and said medial femoral prosthesis component also having a second exterior convex curved surface on said base portion positioned and configured to replicate a medial femoral condyle, and a concave trochlea surface positioned on said first leg portion and configured to articulate with the patella;
• and
• a medial tibial prosthesis component having a first surface configured to be secured to a surgically prepared medial compartment of the proximal end of the tibia and a second concave curved surface configured to receive the second convex curved surface of said medial femoral prosthesis component to permit pivotal motion between said medial femoral prosthesis component and said medial tibial prosthesis component, said pivotal motion approximating the motion of a healthy knee joint;
• 32. A device for bicompartmental arthroplasty of the knee as claimed in claim 31 where in said medial femoral prosthesis component is made of metallic material.

A method of performing bicompartmental arthroplasty of a patent's knee comprising the steps of:

• making an incision along the anterior medial aspect of the knee;
• excising the remnants of the medial meniscus;
• surgically preparing the medial compartment of a proximal end of the patient's tibia to receive a medial tibial prosthesis component in a manner so as to preserve the integrity of the anterior and posterior cruciate ligaments;
• said medial tibial prosthesis component, said medial tibial prosthesis component having a first surface configured to be secured to said surgically prepared medial compartment of the proximal end of the tibia and a second concave curved surface;
• rotating the patient's patella approximately 90 degrees;
• surgically preparing the medial compartment of a distal end of the patent's femur to receive a medial femoral prosthesis component, said medial femoral prosthesis component having a first leg portion and a second leg portion and a base portion connected between said first and second leg portions to form an essentially U shaped component, said medial femoral prosthesis component having a first interior surface configured to be secured to a surgically prepared medial compartment of a distal end of the patient's femur so that the base portion contacts the distal end of the femur, said first leg portion contacts the anterior surface of the distal end of the femur, and the second leg portion contacts the posterior surface of the distal end of the femur, and said medial femoral prosthesis component also having a second exterior convex curved surface on said base portion, and an exterior concave trochlea surface positioned on said first leg portion and configured to articulate with the patella;
• said second convex curved surface on said base portion configured to articulate with the second concave curved surface of said medial tibial prosthesis component to permit articulation between said medial femoral prosthesis component and said medial tibial prosthesis component, said articulation motion approximating the articulation of a healthy knee joint;
• securing the medial femoral component to the femur;
• securing the medial tibial component to the tibia;
• positioning the patella over the trochlea surface of the medial femoral prosthesis component;
• closing the incision.

A device for bicompartmental arthroplasty of the knee comprising:

• a lateral femoral prosthesis component having a first internal surface configured to be secured to a surgically prepared lateral compartment of a distal end of a patient's femur and a second exterior convex curved surface positioned and configured to replicate a lateral femoral condyle;
• said lateral femoral prosthesis component also having a concave trochlea surface positioned and configured to articulate with the patella;
• and
• a lateral tibial prosthesis component having a first interior surface configured to be secured to a surgically prepared lateral compartment of a proximal end of the patent's tibia and a second concave curved exterior surface configured to receive the second convex curved surface of said lateral femoral prosthesis component to permit pivotal articulation between said lateral femoral prosthesis component and said lateral tibial prosthesis component, said pivotal articulation approximating the articulation of a healthy knee joint.

A method of performing bicompartmental arthroplasty of a patient's knee comprising the steps of:

• making an incision along the anterior lateral aspect of the knee;
• excising the remnants of the lateral meniscus;
• surgically preparing the lateral compartment of a proximal end of the patient's tibia to receive a lateral tibial prosthesis component in a manner so as to preserve the integrity of the anterior and posterior cruciate ligaments;
• said lateral tibial prosthesis component having a first surface configured to be secured to said surgically prepared lateral compartment of the proximal end of the tibia and a second concave curved surface positioned and configured to replicate a lateral femoral condyle;
• rotating the patella approximately 90 degrees;
• surgically preparing the lateral compartment of a distal end of the patient's femur to receive a lateral femoral prosthesis component having a concave trochlea surface;
• said lateral femoral prosthesis component also having a first surface configured to be secured to said surgically prepared lateral compartment of the distal end of the femur and a second convex curved surface configured to articulate with the second concave curved surface of said lateral tibial prosthesis component to permit pivotal articulation between said lateral femoral prosthesis component and said lateral tibial prosthesis component, said pivotal articulation approximating the articulation of a healthy knee joint;
• securing the lateral femoral component to the femur;
• securing the lateral tibial component to the tibia;
• positioning the patella over the concave trochlea surface of the lateral femoral prosthesis component;
• closing the incision.

A device for bicompartmental arthroplasty of the knee comprising:

• a lateral femoral prosthesis component having a first leg portion and a second leg portion and a base portion connected between said first and second leg portions to form an essentially U shaped component, said lateral femoral prosthesis component having a first interior surface configured to be secured to a surgically prepared lateral compartment of a distal end of the patient's femur so that the base portion contacts the distal end of the femur, said first leg portion contacts an anterior surface of the distal end of the femur, and the second leg portion contacts a posterior surface of the distal end of the femur, and said lateral femoral prosthesis component also having a second exterior convex curved surface on said base portion positioned and configured to replicate a lateral femoral condyle, and a concave trochlea surface positioned on said first leg portion and configured to articulate with the patella;
• and
• a lateral tibial prosthesis component having a first surface configured to be secured to a surgically prepared lateral compartment of the proximal end of the tibia and a second concave curved surface configured to receive the second convex curved surface of said lateral femoral prosthesis component to permit pivotal motion between said lateral femoral prosthesis component and said lateral tibial prosthesis component, said pivotal motion approximating the motion of a healthy knee joint;

A method of performing bicompartmental arthroplasty of a patent's knee comprising the steps of:

• making an incision along the anterior lateral aspect of the knee;
• excising the remnants of the lateral meniscus;
• surgically preparing the lateral compartment of a proximal end of the patient's tibia to receive a lateral tibial-prosthesis component in a manner so as to preserve the integrity of the anterior and posterior cruciate ligaments;
• said lateral tibial prosthesis component, said lateral tibial prosthesis component having a first surface configured to be secured to said surgically prepared lateral compartment of the proximal end of the tibia and a second concave curved surface;
• rotating the patient's patella approximately 90 degrees;
• surgically preparing the lateral compartment of a distal end of the patent's femur to receive a lateral femoral prosthesis component, said lateral femoral prosthesis component having a first leg portion and a second leg portion and a base portion connected between said first and second leg portions to form an essentially U shaped component, said lateral femoral prosthesis component having a first interior surface configured to be secured to a surgically prepared lateral compartment of a distal end of the patient's femur so that the base portion contacts the distal end of the femur, said first leg portion contacts the anterior surface of the distal end of the femur, and the second leg portion contacts the posterior surface of the distal end of the femur, and said lateral femoral prosthesis component also having a second exterior convex curved surface on said base portion positioned and configured to replicate a lateral femoral condyle, and an exterior concave trochlea surface positioned on said first leg portion and configured to articulate with the patella;
• said second convex curved surface on said base portion configured to articulate with the second concave curved surface of said lateral tibial prosthesis component to permit articulation between said lateral femoral prosthesis component and said lateral tibial prosthesis component, said articulation motion approximating the articulation of a healthy knee joint;
• securing the lateral femoral component to the femur;
• securing the lateral tibial component to the tibia;
• positioning the patella over the trochlea surface of the lateral femoral prosthesis component;
• closing the incision.

A device for bicompartmental arthroplasty of the knee comprising:

• a femoral prosthesis component configured for the patellofemoral and only one other compartment of the knee having a first internal surface configured to be secured to a surgically prepared one other compartment of a distal end of a patient's femur so that the anterior and posterior cruciate ligaments remain intact;
• said femoral prosthesis component also having a second exterior convex curved surface positioned and configured to replicate a femoral condyle for that one other compartment and a concave trochlea surface positioned and configured to articulate with the patella;
• and
• a tibial prosthesis component configured for said one other compartment of the knee having a first interior surface configured to be secured to a surgically prepared one other compartment of a proximal end of the patent's tibia and a second concave curved exterior surface configured to receive the second convex curved surface of said femoral prosthesis component to permit pivotal articulation between said femoral prosthesis component and said tibial prosthesis component, said pivotal articulation approximating the articulation of a healthy knee joint.

A method of performing bicompartmental arthroplasty of a patellofemoral and only one other compartment of a patient's knee comprising the steps of:

• making an incision along the anterior aspect of said one other compartment of the knee;
• excising the remnants of the meniscus of said one other compartment;
• surgically preparing the one other compartment of a proximal end of the patient's tibia to receive a tibial prosthesis component in a manner so as to preserve the integrity of the anterior and posterior cruciate ligaments;
• said tibial prosthesis component having a first surface configured to be secured to said surgically prepared one other compartment of the proximal end of the tibia and a second concave curved surface;
• rotating the patella approximately 90 degrees;
• surgically preparing the one other compartment of a distal end of the patient's femur to receive a femoral prosthesis component having a concave trochlea surface;
• said femoral prosthesis component also having a first surface configured to be secured to said surgically prepared one other compartment of the distal end of the femur and a second convex curved surface configured to articulate with the second concave curved surface of said tibial prosthesis component to permit pivotal articulation between said femoral prosthesis component and said tibial prosthesis component, said pivotal articulation approximating the articulation of a healthy knee joint;
• securing the femoral component to the femur;
• securing the tibial component to the tibia;
• positioning the patella over the concave trochlea surface of the femoral prosthesis component;
• closing the incision.