EXHIBIT 31.3
CERTIFICATION
I, Ken Reali, certify that:
| 1. | I have reviewed this Amendment No. 1 to Annual Report on Form 10-K of TranS1 Inc.; and |
| 2. | Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report. |
| Date: April 30, 2013 | |
/s/ Ken Reali | |
| Ken Reali | |
President and Chief Executive Officer (Principal Executive Officer) |