Using Subject-Specific Reference Cyclograms on the Gait Evaluation of a Cerebral Palsy Patient

Cyclograms are parametric curves composed by the angle trajectory curves of two joints and are an easy way of visualizing and condensate information. The features of Hip-Knee cyclograms can be used to evaluate and asses patient deviation from normality and to track treatment progress. Different joints of the patient can be used for the generation of this parametric curves, as well as the same joint for dominant and non-dominant limb. This former type of cyclograms are called bilateral cyclograms and provide insights of patient symmetry through their geometric properties. The present gait evaluation method is based on the comparison of patient cyclograms with healthy subject cyclograms. In order to obtain a reliable comparison, healthy subject-specific cyclograms should be used instead of generic standard cyclograms because joint angle curves are heavily influenced by subject characteristics (age, height, weight) and gait speed. In the present work, subject-specific knee and hip healthy reference curves are generated for a patient diagnosed with Cerebral Palsy using an Extreme Learning Machine. In this way features of importance to patient gait evaluation can be extracted and compared against several healthy reference cyclograms.