Hi there, hope the explanations have helped. A 4th degree tear is sometimes described as tearing 'front to back' which isn't a bad way of looking at it in terms of severity but it isn't necessarily totally accurate.
It sounds like your appointment is a routine follow up with a gynae consultant. Many hospitals have these as standard for 3rd and 4th degree tears.
They will likely ask you about how you've healed, as far as you know yourself, how you feel, continence issues etc and will examine you.
Personally i would ask to be referred to a colorectal consultant who can perform a series of physiological tests to ascertain how well your repair has worked, as this cannot be accurately assessed by a digital examination. If the repair hasn't worked particularly well, then it's best to get it sorted out now rather than in the future as this gives you your best chance of a strong and lasting repair. Plus, the colorectal people are the experts in 'bums' and a 4th degree tear means there has been damage to your bum - to put it very crudely.
I would also ask for a referral to an obstetric physio as per previous message.
I had my first child 2 years ago tomorrow, and had a 4th degree tear. It has never healed, alas. But I have gone on to have another child and hope to be on the mend on the bum front in the next few weeks!
Child2 screaming, must fly....x