Abstract
Diagnosis of bone tumors is often difficult for even Orthopaedic surgeon, because they've shown various X-ray's appearances and clinical findings according as their growth. Through an experience of writing a program of Diagnostic Expert System for Bone Tumors using a Fuzzy Method, We considered the utilization of Fuzzy Method for Orthopaedic Surgery. Expert system permitting to input a vague expression had many advantages over another system to reject such an expression in it had been able to input the symptom and X-ray's appearance of bone tumors by natural expression for clinician.
