Defense experts often attempt to move into the medical arena and essentially call your doctor a liar. Be prepared to pit your doctor against their biomechanical expert. If it is done effectively, it is often a very powerful tool at the time of trial. Next, attempt to develop your client as an individual. Biomechanical experts often talk in statistics of the general population.
All human beings are different.
To your own doctor, or to your own biomechanical expert, you should be prepared to point out how your client is different than many of the statistical clients that the defense expert will be using against you. Point out the differences in the anatomy, and attempt to get the doctor or the biomechanical expert to admit that people are different and that we act differently to forces in accidents. That some people will walk away from an accident with no injury at all, while others will be severely injured. They do not like to discuss that, but eventually they have to admit it to a certain extent. Finally, use humor against biomechanical experts.