We have developed a new arthroscope with a field of view of 150˚. This arthroscope requires
less motion to maneuver and exhibits reduced optical error. It also improves how novices
learn arthroscopy. We hypothesized that the surgical performance with this arthroscope is
superior to that with a conventional arthroscope. This study tested the hypothesis by using
motion analysis and a new validated parameter, “dimensionless squared jerk” (DSJ).
We compared the surgical performance between the use of the wide-angle arthroscope and
that of the conventional arthroscope among 14 novice orthopedic residents who performed 3
standardized tasks 3 times with each arthroscope. The tasks simulated the surgical skills in
arthroscopic rotator cuff repair. The arthroscope motion was analyzed using an optical tracking system. The differences in performance parameters, such as the time taken to complete
the tasks, average acceleration of the hands (m/s2
), number of movements, and total path
length (m) including DSJ between the 2 arthroscopes were investigated using paired t-tests.
All estimated values for the tasks using the 150˚ arthroscope were lower than those for the
tasks using the 105˚ arthroscope. Statistically significant differences in performance
between the 2 arthroscopes were observed only for DSJ (p = 0.014) and average acceleration (p = 0.039).
DSJ and average acceleration are reliable parameters for representing hand-eye coordination. The surgical performance of novice arthroscopists was better with the new wide-angle
arthroscope than with the conventional arthroscope.