A method of selecting an implant, the method comprising: obtaining electronic image data of the knee joint and generating a three dimensional shape of the knee joint, wherein the electronic image data is obtained by MRI or CT; characterized in that one or more dimensions and/or shape parameters of a meniscus are determined, wherein the one or more dimensions and parameters are selected from the group comprising maximum anterior-posterior distance of the meniscus, maximum medial-lateral distance of the meniscus, size or area of the meniscal attachment(s), maximum length of the anterior horn, maximum and minimum height of the anterior horn, maximum and minimum height of the body, maximum and minimum height of the posterior horn, maximum height and minimum height of the meniscus, maximum and minimum width of the anterior horn, maximum and minimum width of the body, maximum and minimum width of the posterior horn, meniscal radii and angles at various locations, and deriving a 3D geometry of a diseased meniscus from measurements from neighboring articular surfaces and structures to recreate the shape and size of the diseased meniscus, wherein the measurements are selected from one or more of the following tibial bone dimensions: maximum anterior- posterior distance, maximum medial-lateral distance, maximum distance from the tibial spine to the edge, width of the tibial spines, height of the tibial spines, area of tibial plateau occupied by tibial spines, depth of tibial plateau, 2D and 3D shape of tibial plateau, and/or from one or more of the following femoral condyle bone dimensions: maximum anterior-posterior distance, maximum superior-inferior distance, maximum medial-lateral distance, maximum distance from the trochlea to the medial or lateral edge; width and depth of intercondylar notch, curvature at select regions along the femoral condyle, 2D and 3D shape; designing the implant suitable for use on a condyle of the knee joint or an implant suitable on a portion of the tibial plateau taking into account the dimensions of the meniscus and/or shape parameters of the meniscus or the derived 3D geometry of a diseased meniscus from the measurements from neighboring articular surfaces and structures; and adjusting one or more dimension of the designed implant to achieve an optimal fit with the patient's knee joint. obtaining electronic image data of the knee joint and generating a three dimensional shape of the knee joint, wherein the electronic image data is obtained by MRI or CT; characterized in that one or more dimensions and/or shape parameters of a meniscus are determined, wherein the one or more dimensions and parameters are selected from the group comprising maximum anterior-posterior distance of the meniscus, maximum medial-lateral distance of the meniscus, size or area of the meniscal attachment(s), maximum length of the anterior horn, maximum and minimum height of the anterior horn, maximum and minimum height of the body, maximum and minimum height of the posterior horn, maximum height and minimum height of the meniscus, maximum and minimum width of the anterior horn, maximum and minimum width of the body, maximum and minimum width of the posterior horn, meniscal radii and angles at various locations, and deriving a 3D geometry of a diseased meniscus from measurements from neighboring articular surfaces and structures to recreate the shape and size of the diseased meniscus, wherein the measurements are selected from one or more of the following tibial bone dimensions: maximum anterior- posterior distance, maximum medial-lateral distance, maximum distance from the tibial spine to the edge, width of the tibial spines, height of the tibial spines, area of tibial plateau occupied by tibial spines, depth of tibial plateau, 2D and 3D shape of tibial plateau, and/or from one or more of the following femoral condyle bone dimensions: maximum anterior-posterior distance, maximum superior-inferior distance, maximum medial-lateral distance, maximum distance from the trochlea to the medial or lateral edge; width and depth of intercondylar notch, curvature at select regions along the femoral condyle, 2D and 3D shape; designing the implant suitable for use on a condyle of the knee joint or an implant suitable on a portion of the tibial plateau taking into account the dimensions of the meniscus and/or shape parameters of the meniscus or the derived 3D geometry of a diseased meniscus from the measurements from neighboring articular surfaces and structures; and adjusting one or more dimension of the designed implant to achieve an optimal fit with the patient's knee joint.