Thank you for going to the trouble of sending the useful information, which I checked out. My surgeon said I can return to normal activity and quite the post op. restrictions after 6 weeks. I went into Hos. on a Tues. on both occasions and was out on Fri.
After my Mum had both hips done she was told not to sit on anything lower than 20 inches off the ground, a point also made HERE. The same site also has some specific sports pointers HERE.
So if the 20' rule applies across the board I suspect a bent would be out of the question, but then again if this is flexible dependent on an individuals needs/age/fitness etc, then your Doctor should be able to advise you. I'd find out the seat height of a few bents and speak to your medical professional.
I don't ride a bent myself, (want to try it though), but there are loads of bent people on here, so I'm sure someone will be along with the best places to buy.