Johnny Ludden of the San Antonio Express-News reports: In Thursday night's victory of the Nets, Spurs center David Robinson aggravated his back and will sit out the Spurs' next three games.

On Friday, Robinson received his second steroid injection in the past month,he received his first on Feb.12. The injections are needed to calm the nerve in his lower back and buttocks.

In what will be his final NBA season, Robinson is averaging 9.2 points and 8.4 rebounds per game.