Major Nidal Malik Hasan, who is charged with 13 counts of pre-meditated murder, was shot several times after he allegedly opened fire on a crowd of his fellow soldiers.
More than 100 bullets were fired in the troops readiness centre and 42 other people were injured.
Maj Hasan's doctors told him days ago that he will never walk again, said defence attorney John Galligan, who visited with him recently.
Maj Hasan does have some feeling in his hands and is in "significant pain" from his injuries, Mr Galligan said.
"His medical condition is still extremely serious," he said, adding Maj Hasan appeared confused and his speech is a "little garbled".
Asked whether Maj Hasan expressed remorse, Mr Galligan said: "We didn't get into that".