Learn as much as you can about what OMM entails before committing yourself to that education pathway. Watch this video
and conduct a literature review of the data of osteopathy in the cranial field. Would you seek this treatment (and pay for it accordingly) for yourself or your family members?
This is a single example of the many fringe entities of OMM and cranial, along with Chapmans reflexes, are the two most common cited pseudoscientific components to the curriculum. But a lot of the less fringe treatment modalities as well as osteopathic diagnostic criteria are similarly devoid of validity.
Example: Fryette's Laws were literally taught as medical gospel at my school. And for a set of "Laws," repeat motion studies in radiographic imaging and cadaver models have failed to show any evidence of these "Laws."
Diagnoses of somatic dysfunction is the emphasis in OMS1. Studies even among
expert OMM practitioners have consistently had low inter examiner reliability. In one study of OMM practitioners, a wedge was placed under a subject's heel (unknowingly to the practitioner). Sometimes the left, sometimes the right, sometimes neither and so on... Then the practitioners were evaluated for their ability to detect this 5mm change. All levels of experience level weren't able to consistently detect this. When you're assessed in OMM ability in DO school, you're diagnosing
asymptomatic medical students and getting graded on a faulty premise.
Note that your grades and advancement in medical education are dependent on whether or not your DO examiners agree with your findings. If they disagree with your perception of the bones' orientation, you will score low or won't pass altogether. Its not like they pull out calipers and have numeric values for this. It is all eyeballed and ballparked, and it can come down to their word against yours.
Osteopathic
treatments are the emphasis OMS2, where you're graded on whether not the condition improves. Some treatment modalities you get graded on are "sleight of hand" akin to the above video (BLT, CS, soft tissue...). And after a treatment is performed, your grade depends on the same conundrum as above.
Always give the professors the benefit of the doubt, but if you happen to fall on their bad side (say, from being critical in any way of principles in OMM), you might join the small ranks of students who all of a sudden find it difficult to pass OMM labs. There have been students dismissed from DO school solely from their OMM performance. OMM professors are often not taken seriously by the other academic faculty, and they could jump at a chance to regain their lost footing at the expense of a student.
OMM education within DO schools vary so much- some are a complete breeze and others are a lot more difficult. Most students end up jumping through the hoops just fine, but still no way to predict your aptitude for ballparking and eyeballing bone alignment by seeing and feeling with your hands.
90 to 95% of DOs do not do manipulations. I think the frequency at which its practiced speaks for its clinical utility and efficacy. It is nonetheless a pathway to physician, but at least be well informed about it.
Last note... for all my preclinical courses, there was a textbook (e.g. Robbins, Bates, etc.) which are time honored by the majority of medical institutes and usually a great reliable foundation of which the course content is based from. What was the textbook for the osteopathic medicine course at my DO school? A spiral bound Microsoft Publisher document in Comic Sans font compiled by the OMM department at the school, with (generally) n=6 sample size JAOA studies from 50 years or more ago.