Thanks, Terry and Aria. I've been doing some web browsing and had pretty much come to these conclusions, too.
One site says that getting anything less than a motorised version is useless and those start at £600. Well out of my league. It does seem to be the case that getting a cheap version would probably do more harm than good to my knee.
Going to a gym, even temporarily, has the same issues for me right now as going swimming does and so is a bit of a non-starter, but I had been thinking about investigating the possibility of renting something and see how that goes.
But it's a moot point really if they're too expensive.
LabRat
