Tefillin on a paralyzed arm

Hi,

One whose arm does not have blood flow should not put tefillin on that arm; he is viewed halachically as an amputee. One whose arm is only paralyzed, though, puts tefillin on that arm.

(Rav Moshe Feinstein, Igrot Moshe Orach Chaim 1:8)

Have a great day,
Mordechai