Twenty-two U.S. and Canadian markets have the financial wherewithal to support new teams in the National Basketball Association , according to an On Numbers study. But there’s a catch. Two catches, actually. The NBA is not committed to expansion at this time — it’s considering contracting the league. And the league, which locked out its players last month, would need to fashion a new labor agreement before any teams could be added. If those hurdles were cleared, the NBA could choose from a wide array of expansion possibilities, including such prominent candidates as Las Vegas, Louisville, Seattle and Riverside-San Bernardino, Calif.