I guess it depends on where you are in the country and what the local payor mix is like/what the group is like.
It might be that in a big coastal city (NY, SF, LA) you're better off accepting a average income, living frugally and being hospital employed - that's given the low rate of reimbursement on the coasts, HMO penetration, heavy competition (too many orthopedic surgeons), and sometimes a poor payor mix.
If you're in an environment/city where the payor mix is favorable, competition is OK (not an excessive supply of docs), reimbursement is still decent (private insurance pays 2x medicare etc - though it won't be for long), then private group practice can still be more lucrative. This type of environment is probably going to be in the midwest, or the south in a smaller non metro area. Thats just a reality. Its medicine, you have to go where providers are scarce to make money.
Its true though, as time continues, it gets harder and harder to make a significant income in private practice, even in a non metro area.
And yes when you start off, you have to justify your salary, probably take more call than not, and work long hours.
1. hours - private practice will be busy to start, entirely due to call, ironically your days will be empty because you have very few referrals at least for the first few months.
2. income - it depends on where you are in the country - in the coast, there probably isn't a huge difference between. hospital employed and PP; in midwest,south in non metro areas, once you make partner, superior reimbursement rates, ancillary income that still pays - you'll make more than a coastal surgeon employed by the hospital, sometimes 100% more, sometimes more than that. My partners certainly do.
3. freedom of practice - insurance companies will dictate a lot, but that's because surgeons in the past were operating when they shouldn't have, imaging when they shouldn't be - all to make $. It is what it is, there is still freedom to practice; it just takes a lot of paperwork to get an MRI or pre authorization for surgery.
4. Innovation - Actually a good question, probably the best one and one and one that should be asked more often. How do you innovate and make 4 mill/year like Neal elattrache, or 24 mill/year like Burkhart, or millions like Anthony Romeo, Bonutti, Howell, Berger etc etc etc....they're not making that from their clinical work, it's from their device patents.
Well you either need to have an actual idea (not very common), or you need to partner with a powerful company - like Stryker, SN, Zimmer, Arthrex....and they have to have a reason to hire you to speak (surgeon for big time pro sports teams, well published and well spoken researcher at a prominent University, a reason why people would listen to you)...then once you've partnered with them, you slowly slip yourself into product consulting...then product development...then boom, you've got your name on a patent application even if you didn't have too much to do with the idea...you nudged it along and gave some clinical input.
Then you're set!
For that. you need to be at big institution/have your own institution, and be well published. A lot of ortho researchers publish so they can cash in through device development. Which I think is quite neat.