US firms O'Melveny & Myers and Dewey Ballantine have scooped plum roles on the $6.4bn (£3.3bn) buy-out of Triad Hospitals as private equity firms continue to target the healthcare sector.

Los Angeles giant O'Melveny represented private equity duo CCMP Capital Advisors and GS Capital Partners, fielding a team out of its New York and Los Angeles offices. The team was headed by New York partner Greg Gilbert, who co-chairs the firm's transactions department along with corporate partner Harvey Eisenberg.

Dewey represented the target with chairman Morton Pierce spearheading the team along with New York-based corporate partner Michelle Rutta and co-managing partner Gordon Warnke.

Other firms to have advised on the deal include elite Manhattan outfit Sullivan & Cromwell, which represented financial adviser to the consortium Goldman Sachs.

Triad has been a Dewey client since its inception in 1999. The firm has since advised Triad in the issuance of securities in transactions worth more than $2.2bn (£1.1bn) and on M&A deals worth more than $2.3bn (£1.1bn).