The NEURO CLASSIC Carbon system ankle joint is mainly used as a supporting joint for the NEURO SWING Carbon system ankle joint in the system width 20 mm. This may be the case when the NEURO SWING Carbon would be overloaded in a unilateral construction but a bilateral construction is not necessary with regard to the load. The orthotic treatment with a NEURO CLASSIC Carbon system ankle joint as the sole main joint can be useful in exceptional cases. Based on patient data, the Orthosis Configurator determines the optimal combination of functional elements.