Abnormal ground reaction forces in individuals with unilateral transtibial amputations

Background: The number of persons living with transtibial amputations (TTA) in the United States is expected to more than double in the next 45 years due to an increase in aging population and dysvascular diseases. Because of this, it is important for medical professionals to understand the common impairments associated with this population. There is a lack of comprehensive research documenting the ground reaction forces (GRFs) during gait in this population. Objective: The purpose of this research is to study the multi-directional GRFs during gait in persons with TTA. Methods: Eight adults with unilateral TTAs participated in this study. Ground reaction forces were measured using a Kistler platform. Results: A t-test was used to determine significant GRF variability between limbs. P-values were significant during loading response in the medial lateral plane (p = 0.0008) and the vertical plane (p = 0.0157.) There were no significant findings during mid-stance. P-values at terminal stance were significant in the medial lateral plane (p = 0.0028.) Discussion: There are asymmetrical ground reaction forces associated with having a TTA amputation that most significantly effect loading response and terminal stance. Correcting these asymmetries should be the focus for physical therapy interventions in this population.