@cathymw

Jiffy knee is not really new. It is a trademarked version of a subvastus method which has been around for a long time.
In my opinion, and that of my incredible hip/knee surgeon, extensive successful experience is the key to any such surgery, whether it be by Jiffy Knee or any other method, even the traditional method. The only problem with a subvastus approach is that it gives the surgeon a much smaller and more difficult field to work in and that requires greater skill.
I told my surgeon that a buddy of mine was scheduled to get a Jiffy Knee in December. He told me that in his opinion, the key issue is the extensive successful experience. He asked me which Jiffy surgeon it was and when I told him he replied that he had not seen any problems from that surgeon's work (my surgeon spends about 20% of his time doing revisions of other surgeons' work) which is a compliment.
One advantage of Jiffy Knee is that it trains the surgeon in more modern techniques. For example, if a potential knee replacement candidate has a surgeon who still uses a tourniquet routinely, my advice would be to hobble as fast as possible to the exit door. The scientific evidence is now clear that a tourniquet is not helpful and may even be harmful for a TKR. Jiffy knee doctors do NOT use a tourniquet.
Check out the experience of the Jiffy Knee surgeons in your area. Read reviews. consider other surgeons using similar methods. I was not only bone on bone but severely misaligned. However, my ACL appeared to be viable and I also wanted a bicruciate retaining implant ("BCR") which requires more complex surgery. My guy did a mini midvastus entry, found my ACL was strong and did a BCR and did a functional alignment of my new knee. I had NO meaningful post surgery pain and never took any of the Oxycodone pills that were prescribed.

Once you identify potential surgical candidates, make sure that the experience is with the particular surgery you are about to get. If a surgeon was very experienced doing traditional knee surgeries, and had recently been trained in and commenced doing Jiffy knees, I would want him to have at least a hundred of the Jiffy Knees under his belt before I trusted him to do mine. I don't count the thousands of traditional surgeries he may have done.

What you are doing is trying to maximize your opportunities for a successful outcome. Knee surgeries are bell curves like most things in life. What you are trying to do is to put yourself as close as possible to the positive side of the bell curve and hope to be an outlier on that side. But chance does play a role and no matter how good the surgeon is, one can end up on the wrong side. But I like to maximize my chances and I have twice ended up an outlier on the positive side (same surgeon: left hip replaced about three years ago; right knee replaced 27 days ago; heading to the golf course when I finish up these notes).