I have worked with clients with "hysterical" conditions, which are typically neurological. If it is psychogenic, I was advised by the psych experts that physiotherapy is appropriate and that our role is to provide an environment in which they can recover with dignity. It is not appropriate to state it is a psychogenic condition or confront them, but you could gently suggest some counselling may help with her anxiety and depression and help her knee secondarily.

If CRPD, it is appropriate to educate re the influence of stress and anxiety on the immune and pain systems. Marj