11.   Brown twisted his back as he stood up to yell instructions.

12.   Denver linebacker Glenn Cadrez twisted his back in the third quarter.

13.   Greineder told police he was walking with his wife and their dog in the woods when his wife stepped on a rock and said she twisted her back.

14.   Serena Williams advanced when third-seeded Jana Novotna, the Wimbledon champion, twisted her back and had to retire.

15.   Third-seeded Jana Novotna, the Wimbledon champion, twisted her back in the match against Serena Williams and had to retire Thursday from the Porsche Grand Prix.