Obtaining medical records, having the records reviewed by an expert, getting the expert witness to write a report and then to testify are all very necessary and very costly elements of a malpractice case. The costs can easily run into the tens of thousands of dollars. If the case is particularly difficult, the attorney may ask the client to put up at least some of the costs of the suit. If the case is quite strong, the attorney may be willing to front the costs himself. A large number of malpractice cases end in verdicts for the doctor.
Jurors tend to sympathize with doctors who get sued.
They tend to respect the wisdom and judgment of doctors. The law also makes it very difficult for you to win this kind of injury case. The law applicable to medical malpractice cases does not require doctors to be perfect or to practice with mathematical precision. The law of Pennsylvania simply requires that physicians employ such reasonable skill and diligence as is ordinarily exercised in that physician's profession. Your state law is probably similar.