The Capitals signed defenseman Steven Oleksy to a one- three-year, two-way contract and have recalled him from the American Hockey League’s Hershey Bears ahead of Tuesday’s tilt against the Boston Bruins. Oleksy, 27, leads the Bears with 151 penalty minutes and is the second gritty player Washington has added to its lineup in the last week. The Capitals picked up Aaron Volpatti off waivers from Vancouver on Feb. 28. It’s uncertain what the corresponding move will be to accommodate Oleksy’s presence on the 23-man active roster, but it’s possible that the Capitals will place Mike Green (groin) on injured reserve. At this stage it’s unclear what prompted the addition of Oleksy. Each of the six defensemen who suited up in the Capitals’ most recent game at Winnipeg took part in practice Monday. Those pairings were Karl Alzner with Tomas Kundratek, John Erskine with John Carlson and Jeff Schultz with Tom Poti.