TITLE: VALIDATED FINITE ELEMENT METHODS FOR SIMULATING PARTIAL ROTATOR CUFF TEAR.
ABSTRACT: Rotator cuff (RC) tears are the most common cause of shoulder disability, representing one of the highest days-away-from-work rates compared to other work-related injuries. Chronic, degenerative tears can cause pain, decreased range of motion, and weakness, and more than 50% of cases affect individuals over 60 years of age. As Americans age, they remain active and contribute to our workforce longer than has been seen previously. Thus, the impact of RC pathology on activities of daily living and work activities is expected to grow. RC tears can be classified by their depth as either full or partial thickness tears. Previous studies report a higher prevalence of partial tears, but most research has focused on full tears. The goal is to reduce disability and lost days of work in older workers with partial tears, by understanding the exposure of RC tendons during typical work activities with and without specific tools and work practices aimed at reducing this exposure. Exposure will be quantified by spatial stress estimates derived from finite element analysis of patient-specific models of the shoulder. These models will be augmented with in-vivo muscle electromyography (EMG) data to optimize muscle loading; in-vivo upper extremity kinematics; and in-vivo joint moments and force trajectories created from patient-specific inverse dynamics. The FE model will be validated by comparing estimated glenohumeral joint forces with those collected during an ex-vivo cadaveric study.
COMMITTEE: ADVISOR Professor Katherine Zhang, ME/BME/MSE; Professor Ara Nazarian, Harvard Medical School, Orthopaedic Surgery; Professor Harold Park, ME/MSE; Professor Michael Albro, ME/MSE/BME; Professor Joseph DeAngelis, Harvard Medical School, Orthopaedic Surgery; Professor Arun Ramappa, Harvard Medical School, Orthopaedic Surgery; Professor Jack Dennerlen, Northeastern University, Physical Therapy, Movement, and Rehabilitation Sciences