I would like someone to clarify for me what are the differences then between the two educational approaches and resulting degrees. If the curriculum is comparable and the clinical training is comparable (as most of you seem to be claiming), and most DO's end up not using their manipulation training once in practice, then what is the difference? Why go to a DO school if you all you do is assimililate into MD residencies and inherit the "MD culture", if there is such a thing
This topic has been discussed ad nausem in other threads, but your question is not uncommon. The differences in the two are relatively minor these days, the differences are more in training then in actual practice. I used an analogy on another thread that suits this case as well: Think of the D.O. degree and the M.D. degree as 2 separate, yet almost identical neighboring houses. Each house was constructed by a different builder but using the same rough plans. Different mortar and different screws were used to hold it all together. Once built, the 2 neighbors furnished the houses slightly differently according to their own tastes, yet as time progressed, they learned from each other, borrowed and leant tools to one another, etc. From afar or to the layperson, the two houses look very similar, but to the owners, they still look very different. The neighbors may argue about who has the nicer lawn or better car, but at the end of the day, both houses are of equal value, and both are equally resistant to weathering.
Anyway, the point of this analogy is that to a patient (equivalent to the layperson above), both doctors perform equally well, order the same tests, use the same drugs, have similar styles, etc. However, to the doctor (equivalent to the home owners above), the practice styles are not exactly alike, and this slight difference is what often allows the doctor to practice in his/her comfort zone. I realize this may be getting a bit deep, and premed students usually want cold hard facts layered in p-values, but you'll have to do a bit of thinking on this one. As you start to develop a practice style, you may find that your philosophy is very much similar to a D.O. mentality, on paper, that's almost expected these days, as the trend in medicine, MD or DO, is to practice more holistically. D.O.s were just the first to carry the "holistic flag", so-to-speak.
Having family members who are MDs and myself experiencing a D.O. training, I've found through discussions with them the largest difference in philosophy is that the allopathic curriculum doesnt really have a philosophy, or at least one that's been illustrated to date. D.O.s are taught to be generalists first and specialists second, and IMO, there's no better specialist than one who has a firm grasp on primary care. This ideology is manifested in such things as OMM and the osteopathic rotating internship.
OMM isnt the basis of the profession, it's merely a tool to help one reinforce the idea of the body as a unit, not just a collection of organs. 95% of D.O.s dont use it in practice, yet their 300+ more hours of training in biomechanics, physiology and anatomy will help make a D.O. a better generalist, on paper at least. OMM is physical therapy, both use the same techniques with the same principles.
The osteopathic rotating internship was actually modeled after the MD rotating internship that used to be mandatory for MDs 20 years ago, but the MDs did away with it as they became more specialized and less patient in their education. However, they dont discount it's efficacy. 2 NYCOM grads who are going to harvard anesthiology this year were encouraged by harvard to do the rotating internship at a hospital of their choice that offers it because they recognize the great well-rounded training it provides.
I'll shut up now. Hope this helps. If not, I tried. good luck.