Excuse the stupid question but what do you mean by "orthopädic setting"?
Are you referring to the outpatient situation and appointments they have in the weeks or days pre-op or in the hospital the day before the OP?
Immediately pre op I've seen excellent information brochures in hospital (near me)that the patient should have given to them and also explained if neccesary. The ability to comprehend what is about to happen before and straight after OP is sometimes impaired even in the most sensible intelligent clients. The risks etc of OP are normally explained by surgeon/others doctors. Too much info will result in it being forgotten often!
If you mean physio hands on stuff/ treatment then I would not do anything. Maybe check on suitable shoes, walking aids etc, and if time the amount of disability in ROM / muscle weakness existing. They have probably had an amount of outpatient physio over months or years prior to the operation which hasn't helped enough in the end as the joint/soft tissue pathologie hip/knee is too severe.
The "waiting period" you mention is probably very variable depending on the country in question. Here in Switzerland it's relatively short. I've treated hips, as long as it's giving some relief, on an outpatient basis until the OP date is known, then said goodbye till after the inpatient stage. Treatment would depend on what still helps. Some hips are very stiff with less pain, some stiff with severe pain. Some have associated back problems due to hip contractures and bad posture etc over 2-3 years.....Some hips have already crumbled pre-op so I think recomendations as to whether necessary, useless or what to do should be on an individual basis.
Has what I said given you some answers? Do you want interventions to be more specific?