its 4 weeks on from my 2nd tkr, and im still in agony! staying as positive as i can, things like... it will be spring soon, and it wont be long before this pain stops. but i have to be honest its getting me down now, im on tramadol and paracetamol, but nothing ive tried has helped, i guess its time and only time . i want to ask is there anyone sleeping with a pillow under their knees? its the only comfortable way i can sleep but the physio told me off for doing it. also does anyone suffer terrible back pain in bed at night? sleeping is not good at all. just cant get comfy with back pain.