2134/36455
Jeffrey Chun-Yin Lee
Jeffrey Chun-Yin
Lee
Patrick Shu-Hang Yung
Patrick Shu-Hang
Yung
Mak-Ham Lam
Mak-Ham
Lam
Aaron See-Long Hung
Aaron See-Long
Hung
Daniel Fong
Daniel
Fong
Wood-Yee Chan
Wood-Yee
Chan
Kai-Ming Chan
Kai-Ming
Chan
A non-invasive biomechanical device to quantify knee rotational laxity: Verification of the device in human cadaveric specimens
Loughborough University
2018
Tibial rotation
Knee stability
Measurement
Laxity
Medical and Health Sciences not elsewhere classified
2018-12-18 10:47:17
Journal contribution
https://repository.lboro.ac.uk/articles/journal_contribution/A_non-invasive_biomechanical_device_to_quantify_knee_rotational_laxity_Verification_of_the_device_in_human_cadaveric_specimens/9629843
Background: Biomechanical measurement tools have been developed and widely used to precisely
quantify knee anterior-posterior laxity after anterior cruciate ligament (ACL) injury. However, validated
objective device to document knee rotational laxity, though being developed by different researchers, are
not yet widely used in the daily clinical practice. A new biomechanical device was developed to quantify
knee internal and external rotations.
Methods: The reliability of the new biomechanical device which measures knee rotations were tested.
Different torques (1-10Nm) were applied by the device to internally and externally rotate human
cadaveric knees, which were held in a flexion angle of 30 . The rotations were measured by the device in
degrees. There were two independent testers, and each tester carried out three trials. Intra-rater and
inter-rater reliability were quantified in terms of intraclass correlation (ICC) coefficient among trials and
between testers. The device was verified by the comparison with a computer assisted navigation system.
ICC was measured. Mean, standard deviation and 95% confident interval of the difference as well as the
root mean square difference were calculated. The correlations were deemed to be reliable if the ICC was
above 0.75.
Results: The intra-rater and inter-rater reliability achieved high correlation for both internal and external
rotation, ranged from 0.959 to 0.992. ICC between the proposed meter and the navigation system for
both internal and external rotation was 0.78. The mean differences were 2.3 and 2.5 for internal and
external rotation respectively.
Conclusions: A new knee rotational laxity meter was proposed in this study. Its reliability was verified by
showing high correlation among trials. It also showed good correlation to a gold standard of measurement. It might be used to document knee rotational laxity for various purposes, especially after ACL
injury, after further validation of the device in human subjects