Development of Knee Rotational Stability Meter
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Anterior cruciate ligament (ACL) injury, which results in an unstable knee, is a common sports injury among both professional and recreational athletes.
ACL is composed of anteromedial (AM) bundle and posterolateral (PL) bundle, The AM bundle limits anterior-posterior (AP) translation throughout the knee range of movement. The PL bundle limits AP translation and knee rotation.
Currently clinical examinations on knee laxity are relatively subjective and easily influenced by examiners' experiences and skills. Only limited information on AP translation can be obtained with current knee assessment devices.
Therefore, this study aimed to develop a device that can objectively and reliably assess knee rotational stability.

132 patients with unilateral ACL injury were recruited for the study. All the patients were recruited at the sports injury clinic of hospital and were diagnosed by two experienced doctors.
The subject was asked to relax to lie on the examining bed with ankle and crus locked in the air-cast boot, and the femur was locked by a stabilizer as well. The torque and angle sensors were installed under the boot. The tester would hold the stick and give a rotational torque of 5Nm to both internally and externally to the tibia, the collective data was collected from the computer.

There were increased internal and external rotation in ACL-injured knee compared to the contralateral side, however, statistically insignificant (p>005). The most possible reason was that variable rotational speed produced by different operators and in different trials, which may result in different torques. So the device was updated with an electronic motor to provide consistent rotational speed for more trials in the future.
All Author(s) ListXi Li, KamMing Mok, SaiChuen Fu, KaiMing Chan, ShuHang Yun
Name of ConferenceThe 8th WACBE World Congress on Bioengineering
Start Date of Conference30/07/2017
End Date of Conference02/08/2017
Place of ConferenceHong Kong
Country/Region of ConferenceChina
LanguagesEnglish-United Kingdom

Last updated on 2018-20-01 at 18:58