Clinical Investigation of the Freedom SOLO Stentless Heart Valve

Inclusion Criteria: * The patient is male or female 18 years old or older. * The patient is willing to sign the informed consent. * The patient which preoperative evaluation indicated the need for native or prosthetic aortic valve replacement. * Any patient amenable to aortic valve replacement with biological prosthesis should be enrolled in the study, even in conjunction with valve repair, coronary artery bypass grafting and other procedures. * The patient is located in a geographic location that will enable the subject to return to the study site for all follow-up examinations (i.e. geographically stable). * Patient will be available to the investigator(s) for postoperative follow-up beyond one year. Exclusion Criteria: * The patient has preexisting valve prosthesis in the mitral, pulmonary or tricuspid position. * The patient requires a double or triple valve replacement (a valve repair is not considered an exclusion criterion). * The patient has a previously implanted SOLO valve, within the clinical study, that requires replacement. * The patient has active endocarditis. * The patient is or will be participating in a concomitant research study of an investigational product. * The patient is a minor, intravenous drug user, alcohol abuser, prisoner, institutionalized, or is unable to give informed consent. * The patient has a major or progressive non-cardiac disease that, in the investigator's experience, results in a life expectancy of less than 1 year, or the implant of the device produces an unacceptable increased risk to the patient. * The patient is pregnant or lactating. * Patients with congenital bicuspid aortic valve. * Patients are known to be noncompliant or are unlikely to complete the study.