Generating a prediction for at least one implant size for use in arthroplasty is disclosed. Patient demographic factors are received and processed to generate at least one implant size prediction. The processing includes accessing procedure information representing joint replacement procedures previously performed for a plurality of patients and implant information representing types and sizes of implants from a plurality of manufacturers and determining, as a function of at least one statistical model and the accessed procedural information and implant information, unadjusted probabilities of implant size recommendations in a range of implant sizes. At least one processor is further configured for providing, in a graphical user interface operating on at least one user computing device, information representing the respective implant size recommendations and unadjusted probabilities. Further, the at least one processor is configured for receiving a selection of at least one of the respective implant size recommendations.