Design and analysis of plastic and metal-plastic ankle orthosis
Abstract
Design and analysis of plastic and metal-plastic ankle orthosis
Incoming article date: 30.03.2022This study presents two different designs of the ankle-foot orthosis (AFO): the adjustable hinged and the modified static, polypropylene and steel models. The ankle-foot orthosis test is performed in a patient with an ankle fracture as a result of a sports injury. Analysis of AFO models for calculating von Mises stress and fatigue safety margin is demonstrated. Interference, force, and pressure between the AFO contact area and the foot were measured for all subjects using the F-Socket probe, which was used to measure force applied to the ankle joint, for numerical analysis using ANSYS V.R15. Where we can see that the ankle joint has the greatest concentration of load. The stresses and margin of safety in the AFO adjustable joint are 418.9 MPa and 2.4, respectively. Whereas in the modified static AFO the stress and safety margin reached 192.8 MPa and 0.447, respectively.
Keywords: force, pressure, ankle joint, mobile joint, modified statics, ankle-foot orthosis