If I have a gait analysis will I definitely need orthotics?

Firstly it needs to be understood what the problem is so that the physio can start to assertain a solution. Even if the feet are unstable it may be a result of instabilities elsewhere e.g. the hip or spine. Therefore orthotics are not always required after a gait assessment, as sometimes other instabilities need to be addressed prior to contiplating the need for orthotics.