ISAKOS: 2019 Congress in Cancun, Mexico

2019 ISAKOS Biennial Congress ePoster #1710


The Dimensionless Squared Jolt (DSJ): A Novel Objective Parameter That Improves Assessment of Hand Motion Analysis During Simulated Shoulder Arthroscopy

Maulik J. Gandhi, MBChB, BSc(Hons), Swanland, East Yorkshire UNITED KINGDOM
Jae-Man Kwak, MD, Seoul KOREA, REPUBLIC OF
Kyoung-Hwan Koh, MD, Seoul KOREA, REPUBLIC OF
In-Ho Jeon, MD, PhD, Prof., Seoul KOREA, REPUBLIC OF

Asan Medical Center, Seoul, KOREA, REPUBLIC OF

FDA Status Not Applicable


We introduce DSJ as a novel and objective tools to measure arthroscopic shoulder surgical skill.


Introduction. Attempts to quantify hand movements of surgeons during arthroscopic surgery faced limited progress beyond motion analysis of hands and/or instruments. Surrogate markers such as procedure time have been used. The dimensionless squared jolt (DSJ) is a measure of deliberate hand movements. This study tests the ability of DSJ to differentiate novice and expert surgeons (construct validity) whilst performing simulated arthroscopic shoulder surgical tasks.
Methods. Six residents (novice group) and six consultants (expert group) participated in this study. Participants performed three validated tasks sequentially under the same experimental setup (one performance). Each participant had ten performances assessed. Hand movements were recorded with optical tracking system. The DSJ, time taken, total path length, multiple measures of acceleration, and number of movements were recorded.
Results. There were significant differences between novices and experts when assessed using time, number of movements and DSJ. No significant differences were observed in number of movements, maximum acceleration or total path length.
Conclusion. DSJ is an objective parameter that can differentiate novice and expert surgeons’ simulated arthroscopic performances. We propose DSJ as an adjunct to more conventional parameters for arthroscopic surgery skills assessment.