As an aside, I've also met several elderly folk who where given a wheelchair by medical proffessionals, and told to keep their butts in it.
These particular elderly folk did not take kindly to such orders, said "bah" and used their wheelchairs like some mad glorified walker with a big basket.
The thing I always question is why the medical proffesionals involved didn't take into account the stubbornness of some people and figure that sometimes descretion is the better part of valor. If these folks are going to refuse to use it as a wheelchair, then maybe give them a walker instead, because surely that would be safer.