In this article, biomechanics expert, Carolyne Albert introduces the fundamental concepts pertaining to the mechanics of bone injuries. The biomechanical experts at Robson Forensic are engaged when…
In our forensic casework it’s not unusual for all parties to acknowledge that a mishap occurred, but disagree on the cause or severity of injuries claimed to be associated with the event. In this article, we discuss injury causation investigations through the example of an incident in which the plaintiff was struck by merchandise falling from a retail display shelf.
Biomechanics is the science that deals with the time and space response characteristics of biologic solids, fluids and viscoelastic materials to imposed internal and external forces. In more general terms, biomechanics is the science of how the human body responds to applied external and internal forces.
There are three primary modes of loading: tension (pulling), compression (squeezing), and shear (sliding). They can occur alone, or in combination. All other modes of loading are combinations of these three basic modes. For example, in bending, the material on the outside of the bend experiences tension, while that on the inside of the bend experiences compression.
In the context of a forensic investigation, a qualified biomechanical engineer can examine diagnosed injuries and determine if the requisite forces were generated within the incident to cause the injuries claimed. Through reverse engineering, injury causation can be determined.
Description of retail incident
On the day of the incident, the plaintiff was shopping for a modular plastic drawer. The incident product was a 2-drawer unit located on a shelf 56 inches from the ground; it weighed 10.67 pounds and was 22 in. long, 18 in. wide and 26 in. high.
The plaintiff reached up with both hands to grab the drawer unit from the shelf when the item fell and struck her. She covered her head and face with her arms, and the unit struck her arms. The unit also struck her leg and foot. She was bleeding from her left leg as a result of the incident, but she did not fall to the ground and did not lose consciousness.
Following the incident, the plaintiff reported pain in her neck and left shoulder. She went to the Emergency Room on the day after the incident.
Description of injuries
Through subsequent medical examinations, the plaintiff was diagnosed with the following shoulder pathologies:
Anatomy of the shoulder
The shoulder is a complex joint system consisting of three distinct joints: the sternoclavicular joint, acromioclavicular joint, and glenohumeral joint (see figure below). The glenohumeral joint is made up of the glenoid fossa and the head of the humerus; it is the “ball-and-socket” joint that is commonly referred to as the shoulder joint.
investigation & findings
A biomedical engineer from Robson Forensic was retained to determine if the incident generated the necessary mechanisms to cause the diagnosed shoulder pathologies.
Through the course of their analysis our expert found that the plaintiff’s pathologies were not consistent with the forces generated in the incident. As a result of our expert’s involvement in the matter, our client reached a favorable settlement.
Biomechanical experts at Robson Forensic offer a scientific approach to injury causation analysis. Forensic biomechanical investigations can be applied to various scenarios where the cause of an injury is in dispute, such as motor vehicle crashes, sports and workplace events, and falls.
By combining principles of engineering and physics with an understanding of injury biomechanics, our experts can determine whether an injury is consistent with the physical evidence and descriptions of an event. Our experts can also help elucidate whether an injury resulted from a defective product or device, and whether it could have been prevented.
For more information, submit an inquiry or visit our biomechanics practice page.
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