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The Texans placed Arnold (calf) on injured reserve Saturday, Jonathan M. Alexander of the Houston Chronicle reports.
The fourth-year nickel safety seems to have sustained a calf injury at Thursday's practice, and he'll now be forced to miss Houston's next four games after going on IR. Arnold had been having the most productive season of his career thus far, recording 18 total tackles, including one tackle for loss and one forced fumble across eight appearances.
