Detecting knee hyperextension using goniometric inclinometer sensing with vibrotactile feedback

The purpose of this gait analysis study was to further research the electrogoniometric vibrotactile feedback methods that aid in patient gait therapy. As compared to the standard electrogoniometer used in patient therapy a lighter, more comfortable device was designed and analyzed to provide the patient with specific hyperextension information about his/her gait cycle during stance phase. The setup included two sensors fastened onto the thigh and calf. The sensors were connected to a data acquisition system that was interfaced to a computer which sat on a portable rolling cart. Patients walked in a straight line for a total of three trials to obtain an average. A vibratory device was developed as a result of the Phase I initial data collection and analysis process. Phase II included three additional patients who were examined using the vibratory device. "Real-time" feedback was provided to the patient as he/she hyperextended during his/her therapy. Both the patient and the rehabilitation center found this study to be a useful predecessor to a modified device which indicates hyperextension appropriately. The mainstay of the study's focus is that the patient ultimately deciphers the vibratory information for him or herself to rebuild his/her own gait pattern.