Application of three dimensional-printed models in precise diagnosis and customized preoperative plan for knee injury

Purpose: The determination of joint replacement in young patients by imaging techniques alone is always a dilemma for all surgeons. In order to give a clear diagnosis of 19-year-old patients with traumatic knee arthritis, and to determine whether it is suitable for total knee replacement (TKR), the effect of three-dimensional (3D) printing knee joint model in preoperative diagnosis and preoperative design was explored. Materials and methods: After patient’s computed tomography (CT) data were collected, the stereolithographic models of the knee were printed out for direct observation of the damage degree in bone. The selected parameters were compared by computer between the models and bones, and statistical analysis was completed. Based on the preoperative surgical simulation, the individual treatment plan was formulated. Through the above processes, the sizes of prostheses were determined finally, and then the TKR was completed. Result: All parameters did not show a significant difference between bones and models. All ICCs were 1.00. During the operation, it could be observed that the 3D models were highly consistent with bone lesion. The size and shape of prostheses were matched with patient’s bones. The 6 months follow-up results of the patient were satisfactory. Conclusion: The application of 3D printing technology has provided a new way for the diagnosis and treatment of the similar cases when it is difficult to clarify diagnosis and treatment plans by virtue of imaging data.