Translated from sanskrit:
>Advice and stretching to be able to sit in the Lotus position and the Accomplished pose: http://zenmontpellier.voila.net/eng/lotus/lotuseng.html
>
>The Lotus position is better suited for zen meditation. The benefits of the Accompished position are for yoga practitioners (mainly those who wish to practice sexual self-restraint) who want to activate the primal energi which resides in the base of the spine.
Now when we have vacuumed up all the occult/mystic hindu terminology from your sentence, we can examine your statement. I mean why use the sanskrit "asana" instead of the english term "meditation" or "sitting"? Zen uses the term "zazen", which is just the japanese word for seated meditation.
The Lotus position can result in hip joint infections and knee damage if the sitter lacks flexibility in these joints, probably because the body simply isn't meant to bend that way, no matter what indian or japanese "wise men" tell you. The position is also meant to cut off the bloodflow to your legs, so you better get comfortable to doing lots of sitting, because soon enough, with your crippled legs, that's all that you will be comfortable doing.
…and as for the existence of primal energies, that's a hindu concept. The closest japanese concepts would be thq "qi" referred to in taoism and martial arts.