Quote Originally Posted by sono
(Am actually having problems meditating since I had a bad fall some months ago & injured my right knee (& left wrist) as I can't sit in lotus for more than a few minutes at a time - I know it shouldn't matter but I just don't have the same feeling of triangular solid base sitting on a chair on with legs curled under the side of the futon. . . )
You've conditioned yourself to meditate in only one position, that's all. You can (and should!) teach yourself to meditate in other positions. I can meditate sitting in a chair, lying down in my bed, waiting for a bus, riding in the car, in the waiting room of a dentists' office, pretty much anywhere. I deliberately trained myself to do this because I wanted the flexibility. I very much recommend it.

FWIW, I can't sit in a lotus or half-lotus or anything even resembling a lotus position, due to having fat thighs and also having significant problems with my knee joints, so I never meditate that way. Definitely not necessary.