A private equity consortium led by Apax Partners said on Wednesday that it had agreed to buy the medical therapy firm Kinetic Concepts for $6.3 billion, including debt.

The buyout group, which also includes the pension funds Canada Pension Plan Investment Board and the Public Sector Pension Investment Board, expects to close the all-cash deal in the second half of the year, subject to regulatory and shareholder approval.

Apax and the pension funds are paying $68.50 a share for Kinetic, about 6 percent above the closing price on Tuesday, and 21 percent more than the one-month average price before news of the deal was first reported last month.

Kinetic, which is based in San Antonio and provides treatments for wounds and tissue regeneration, reported revenue of $2 billion last year.

Shareholders controlling 11 percent of the company, including the founder, James R. Leininger, have committed their stakes to the deal.

The private equity group hired Morgan Stanley as a financial adviser, and raised debt financing from Morgan Stanley, Bank of America Merrill Lynch and Credit Suisse. Simpson Thacher Bartlett acted as legal counsel, while Kirkland Ellis provided legal advice on the financing.

Kinetic is being advised by J.P. Morgan Securities, and Skadden, Arps, Slate, Meagher Flom and Cox Smith Matthews are acting as legal counsel.

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