GAINESVILLE, Fla.--(BUSINESS WIRE)--Exactech, Inc. (Nasdaq:EXAC), a developer and producer of bone and joint restoration products for hip, knee, shoulder, spine and biologic materials, announced today that it has extended its relationship with Hospital for Special Surgery, New York, NY, to further advance implant designs for total knee replacement surgery. Exactech plans to introduce a new knee implant as an evolution of its flagship Optetrak® brand, as a result of this continued collaboration. Limited release of the new knee is expected in the second half of 2009.