In the movie the Verdict what was the role of the expert witness?

In the movie "The Verdict," the expert witness plays a crucial role in supporting the plaintiff's case against the defendants. Their testimony provides essential credibility and scientific backing, helping to establish the negligence of the medical professionals involved. The expert's insights are pivotal in illustrating the gravity of the harm caused and the impact on the victim's life, ultimately aiding the jury in understanding the complexities of the case.