The MGMA and similar data is sometimes misleading IMO. Who is reporting? Accuracy/honesty? Inclusion of benefits? Also, there is far more variety in Ortho regarding reimbursement/practice type/hours than in pain. Most pain practices are relatively homogeneous beyond a minor variation of scope of procedures. Otherwise it's mostly determined by volume. An outpt. hand surgeon's practice probably doesn't compare to a trauma surgeon or a hip/knee specialist.
FWIW, I work with 10 ortho MDs, mostly general, a hand guy, foot/ankle guy and 2 hip/knee guys. As a moderate volume MSK physician doing two 1/2 days of fluoro time, I make about 30% less than the least productive surgeon and the busiest guy makes almost triple what I do. To paraphrase what someone recently said in another thread, if the Pain doc is making ortho money, there are likely some questionable practices happening...
All that said, agree with bedrock. Stay the course, get board certified, carve out your niche thereafter. Then, in the long run, making ~$300k and having decent hours/job satisfaction beats the pants off making >$500k and hating your life.