Doctors who specialize in sports medicine, including leading authorities on the type of ligament replacement surgery performed on the throwing arm of Stephen Strasburg, say they aren't surprised by the Washington Nationals' decision to end their star pitcher's season early. Even so, they acknowledge no consensus exists on whether it is a necessary step. The approach the Nationals are taking -- shutting down Strasburg once he reaches a yet-to-be-decided cap, possibly between 160-180 innings -- is being scrutinized and studied carefully by everyone from front-office personnel to sports show talking heads, with doctors somewhere in the middle trying to give their best, however differing, advice.