The goal of this research is to model diffuse kinetic characteristics of ankle and knee indicators of spastic hemiplegic patients by cerebral palsy. For those indicators consistent with those used by specialists, in the classical interpretation to classify hemiplegia, proposed by Dr. Gage. Complying with the Children's Orthopedic Hospital protocols in Caracas, Venezuela, records of 178 hemiplegic patients are processed. Through analysis of variance (ANOVA) which indicators are appropriate to classify patterns is determined. The mean, standard deviation and separation threshold in those specific indicators are calculated. The membership function describes the ranges belonging to specific groups. According to the calculated parameters and the information obtained, a diffuse pattern on a flowchart used to discriminate between types hemiplegic is constructed, as done in the classical interpretation. 75% of records are processed and remaining 25% validates the results, depending on the degree of membership and sensitivity. A sensitivity of 83.33% for type 1 is obtained; 75% for type 2; 62.5% for type 3 and 85.7% for type 4. The indicators are described for all specialists through an appropriate medical language.