Patient-Adapted and Improved Articular Implants, Designs and Related Guide Tools

A femoral implant for replacing a knee joint of a patient comprising:

• a. a medial condyle having a medial articular surface that includes a medial sagittal curve derived from a corresponding medial condyle of the knee joint of the patient;
• b. a lateral condyle having a lateral articular surface that includes a lateral sagittal curve derived from a corresponding lateral condyle of the knee joint of the patient;
• and
• c. a trochlear portion having a trochlear articular surface that includes a trochlear sagittal curve derived from the trochlear region of the knee joint of the patient,
• wherein a distance between medial and lateral condyles on the implant is derived from patient-specific data and is adapted to substantially match a corresponding distance between the medial and lateral femoral condyles of the knee joint of the patient, or a predetermined percentage thereof,
• and wherein the medial, lateral and trochlear sagittal curves are substantially J-curves derived from the corresponding, respective medial, lateral and trochlear J-curves of the knee joint of patient.

A femoral implant for replacing a knee joint of a patient comprising:

• a. a medial condyle having a medial articular surface that includes a medial sagittal curve derived from a corresponding medial condyle of the knee joint of the patient;
• b. a lateral condyle having a lateral articular surface that includes a lateral sagittal curve derived from a corresponding lateral condyle of the knee joint of the patient;
• and
• c. a trochlear portion having a trochlear articular surface that includes a trochlear sagittal curve derived from the trochlear region of the knee joint of the patient,
• wherein a cross-sectional perimeter shape of the implant is derived from patient-specific data and is adapted to substantially match a corresponding cross-sectional perimeter shape of the patient's femur, or a predetermined percentage thereof,
• and wherein the medial, lateral and trochlear sagittal curves are substantially J-curves derived from the corresponding, respective medial, lateral and trochlear J-curves of the knee joint of patient.

A femoral implant for replacing a knee joint of a patient comprising:

• a. a medial condyle having a medial articular surface that includes a medial sagittal curve derived from a corresponding medial condyle of the knee joint of the patient;
• b. a lateral condyle having a lateral articular surface that includes a lateral sagittal curve derived from a corresponding lateral condyle of the knee joint of the patient;
• and
• c. a trochlear portion having a trochlear articular surface that includes a trochlear sagittal curve derived from the trochlear region of the knee joint of the patient,
• wherein a volume of a portion of the implant derived from patient-specific data and adapted to substantially match a corresponding volume of a portion of the patient's femur, or a predetermined percentage thereof,
• and wherein the medial, lateral and trochlear sagittal curves are substantially J-curves derived from the corresponding, respective medial, lateral and trochlear J-curves of the knee joint of patient.