I recall when my wife went for the ROSS procedure in 1997, the concensus/data then was that there was more likelyhood that her PV in the aortic position would last longer (20+ years) than a homograft would. Glad you got 20 years out of your homograft.given that homografts existed back then too (I had mine in 1992), I find it hard to see how they consciened it in that evidence, except in the furtherance of their "research".
Do your research on Homograft ... similar benefits list
The Reality of Reoperation
A common misconception is that the Ross Procedure takes a one-valve disease and turns it into a two-valve disease and can result in early reoperation of the autograft (the new aortic valve) or the homograft (the human donor valve in the pulmonary position). However, the data paints a different picture.
Fifteen (15) years after surgery, almost 9 out of 10 patients continue to live without requiring a second intervention of either the pulmonary autograft or the homograft.1-3,14,16-19
Which Line do You Want to be on When it Comes to the Reality of Reoperation? Figure C - Comparison of Long-Term Outcomes among the Ross Procedure, Mechanical Aortic Valve Replacement, and Bioprosthesis for Young Adults13
The Ross Procedure - The Ross Procedure