My understanding is this - it's rare for surgeons to do a thorocoplasty UNLESS they are also "in there" doing fusions. Some orthopedic surgeons won't do them at all. Others do them routinely. The rib cavity is slightly smaller after a patient has a thorocoplasty and that is the reason some surgeons avoid it.
I also understand that there generally isn't a medical benefit to a thorocoplasty. It's more about appearance when you are bent over AND feeling more comfortable in chairs. I'm no doctor and there are other people on the forum who know a lot more than myself. I'm just sharing what I've "picked up".
Ginger Woolley
Oct 2018, L3 - S1, Anterior & Posterior, Dr Sigurd Berven, UCSF, San Francisco
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May 2008, T4 - L3, Dr. Ohenaba Boachie, Hospital for Special Surgery, NYC
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Sept 1967, T4 - T 11, without instrumentation, Dr Thomas Brown, Stanford