1. A method for evaluating accuracy of an image analysis process for indirect measurements of parameters associated with a cartilage defect of a joint using image data of the joint, comprising: generating a physical model of the cartilage defect from the joint, wherein the physical model includes a wax model; deriving a volume of the cartilage defect from the wax model using fluid displacement; comparing the volume to a corresponding parameter of the cartilage defect, wherein the corresponding parameter is derived from the image data of the joint, and determining the accuracy of the image analysis process for deriving the corresponding parameter.