“Generally, the opinion testimony of an expert is admissible if the expert is qualified by knowledge, skill, experience, training, or education in a field that has ‘at least a modicum of reliability’ and the testimony would assist the jury in understanding the evidence.” Turner v. Williams, 326 Ill. App. 3d 541, 552 (2001), quoting Wiegman, 308 Ill. App. 3d at 799. However, an expert’s opinion is only as valid as the reasons for the opinion. Soto v. Gaytan, 313 Ill. App. 3d 137, 146 (2000). Thus, the party calling an expert witness must lay a foundation sufficient to establish that the information upon which the expert bases his opinion is reliable.” Turner, 326 Ill. App. 3d at 553.
Whether to admit expert reconstruction testimony turns on the usual concerns of whether expert opinion is appropriate generally. Zavala v. Powermatic, Inc., 167 Ill. 2d 542, 546 (1995). As such, for reconstruction testimony to be admissible, there must be sufficient data about the accident in evidence to provide a reasonable basis for the expert’s opinion. Hiscott v. Peters, 324 Ill. App. 3d 114, 123 (2001).
In addition, where eyewitness testimony of the accident is available, accident reconstruction testimony may be used to supplement the eyewitness testimony as long as such testimony “would be needed to explain scientific principles to a jury and enable it to make factual determinations.” Watkins v. Schmitt, 172 Ill. 2d 193, 206 (1996) (“[T]he fact that there were three eyewitnesses who could testify as to the speed of the cement truck does not amount to an absolute bar to expert reconstruction testimony. Instead, we look at whether, in addition to eyewitness testimony, expert reconstruction testimony would be needed to explain scientific principles to a jury and enable it to make factual determinations”); Zavala, 167 Ill. 2d at 546, quoting Plank v. Holman, 46 Ill. 2d 465, 471 (1970) (stating that “expert reconstruction testimony is proper, even where there is an eyewitness, if what the expert offers is ‘knowledge and application of principles of science beyond the ken of the average juror’ ”). Evidence is “beyond the ken” of the average juror when it involves knowledge or experience that a juror generally lacks. Rinesmith v. Sterling, 293 Ill. App. 3d 344, 348 (1997).
According to his evidence deposition, Dr. Schipplein determined that of the two accident scenarios presented by the evidence he reviewed, the scenario offered by Jorgenson’s employees (that plaintiff was injured while on the ground) was “more likely.” Dr. Schipplein concluded that had plaintiff been hit by the steel bar while on the trailer as he testified, his foot would have been pinned down, he would not have been able to lunge for the adjacent truck, and the bar would have either continued to roll over him, crushing him to death, or a “wedging effect” would have occurred between the bar and plaintiffs