I haven't come across this yet but I'm sure I shall ( maybe Pilates is helping)? However DH, with two knee replacements, has awful problems. He uses a special cushion that I ordered through a catalogue, to raise his sofa seat. In restaurants he tries to get carver-type seats as upper body strength is good and he levers himself up somehow. He uses the top of the open car door to get out of the car, and when faced with a sofa he feels he would not get up from, he asks for a normal chair and I often have to push against it to stabilise it when he gets up, all of which exercise takes a long time. ageing, as Soop would say, is a buggeration 