BUZZ-NuVasive: Tumbling as Smith & Nephew strikes Osiris deal
** NuVasive shares tumble 7.2 pct to $54.48 in Tues morning trading, on pace for biggest one-day percentage drop in two months
** Medical device co's share drop comes as British medical products maker Smith & Nephew said it would buy U.S.-based regenerative medicine maker Osiris Therapeutics for $660 mln
** NUVA shares had surged over 13 pct on Feb 11 after a Financial Times report that Smith & Nephew had held talks to buy co in a deal valued at more than $3 bln
** NUVA shares on Tues are biggest percentage decliners in S&P 1500 healthcare sector
** YTD, NUVA shares now up 9.5 pct vs 5 pct rise for S&P 1500 healthcare sector
** Seven "buy" or "strong buy" analyst ratings on NUVA shares, 10 "hold" ratings, two have "sell"; median PT $56