Freedom SOLO Stentless Heart Valve Study

Inclusion Criteria: * The subject is male or female 18 years old or older. * The subject or subject's legal representative is willing to sign the informed consent. * The subject which preoperative evaluation indicated the need for native or prosthetic aortic valve replacement. * Any subject 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 subject 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). * Subject will be available to the investigator(s) for postoperative follow-up beyond one year. Exclusion Criteria: * The subject has preexisting valve prosthesis in the mitral, pulmonary or tricuspid position. * The subject requires a double or multiple valve replacement (a valve repair is not considered an exclusion criterion). * The subject has a previously implanted SOLO valve, within the clinical study, that requires replacement. * The subject has active endocarditis or myocarditis. * The subject is or will be participating in a concomitant research study of an investigational product. * The subject is a minor, drug abuser, alcohol abuser, prison inmate, institutionalized, or is unable to give informed consent. * The subject 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 subject. * The subject is pregnant, planning to become pregnant or lactating. * The subject has a congenital bicuspid aortic valve. * The subject is known to be noncompliant or is unlikely to complete the study. * The subject is undergoing renal dialysis for chronic renal failure or has been diagnosed with hyperparathyroidism. * The subject has had an acute preoperative neurological deficit, myocardial infarction, or cardiac event that has not returned to baseline or stabilized ≥30 days prior to the planned valve implant surgery. * The subject has extensive calcification of the aortic root where removal of the calcified tissue cannot be achieved. * The subject has a significantly dilated aortic root that is not surgically corrected. * The subject requires replacement of the aortic root / full root procedure.