The Nationals have been careful with Stephen Strasburg's right arm -- so careful that they shut him down before the playoffs last season to protect his surgically repaired right elbow. So the team and its fans are likely relieved to hear from GM Mike Rizzo that Strasburg's arm is "structurally perfect." That sure beats manager Davey Johnson's gloomier assessment Monday night that Strasburg "doesn't look right to me."

So Strasburg (1-4, 3.13 ERA) can make good on his pledge to not miss a start and try to bounce back from a six-inning no-decision against the Braves, in which he struggled to keep his arm loose and throw strikes. But the whole episode makes us wonder: How much caution with a pitching prospect's arm is enough -- or too much?

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