Evaluation of an accelerometer to assess knee mechanics during a drop landing |
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| Institution: | 1. Department of Joint Surgery and Sports Medicine, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Bunkyo-ku, Tokyo, Japan;2. Department of Orthopaedic Surgery, Tokyo Medical and Dental University Hospital of Medicine, Bunkyo-ku, Tokyo, Japan;3. Dipartimento Rizzoli Sicilia, Ortopedia e Traumatologia, Università di Bologna, Bagheria, PA, Italy;4. National Hospital Organization Disaster Medical Center, Midoricho, Tachikawa-shi, Tokyo, Japan;1. Mayo Clinic Biomechanics Laboratories, Department of Orthopedic Surgery, Mayo Clinic, Rochester, MN, USA;2. Sports Medicine Center, Mayo Clinic, Rochester, MN, USA;3. Department of Physiology & Biomedical Engineering, Mayo Clinic, Rochester, MN, USA;4. Department of Biomedical Engineering, Universidad EIA, Medellin, Colombia;5. Mayo Clinic Graduate School of Biomedical Sciences, Mayo Clinic, Rochester, MN, USA;6. Department of Physical Medicine & Rehabilitation, Mayo Clinic, Rochester, MN, USA;1. Biomechanics, Ergonomics and Engineering Laboratory, School of Kinesiology and Health Studies, 28 Division Street, Queen''s University, Kingston, Canada;2. Department of Surgery, School of Medicine, Queen''s University & Kingston General Hospital, 76 Stuart Street, Queen''s University, Kingston, Canada |
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| Abstract: | Non-contact anterior cruciate ligament (ACL) injuries account for 70% of all ACL injuries, and can lead to missed time from activity for athletes and a predisposition for knee osteoarthritis. Prior research has shown that athletes who land in a stiff manner, with larger internal knee adduction and extension moments, are at greater risk for an ACL injury. A three-dimensional accelerometer placed at the tibial tuberosity may prove to be a low-cost means of assessing these risk factors. The primary purpose of this study was to compare tibial accelerations during drop landings with kinematic and kinetic risk factors for ACL injury measured with three-dimensional motion capture. The secondary purpose of this study was to compare these measures between soft and stiff landings. Participants were instructed to land bilaterally in preferred, soft, and stiff manners. Peak knee flexion decreased significantly from soft to stiff landings. Peak internal knee extension moment, peak anterior/posterior knee acceleration, and peak medial knee acceleration all increased significantly from soft to stiff landings. No associations were found between landing condition and either frontal plane knee angle at maximum vertical ground reaction force or peak internal knee adduction moment. Significant positive associations between kinetics and accelerations were found only in the sagittal plane. As such, while a three-dimensional accelerometer could discern between soft and stiff landings in both planes, it may be better suited to predict kinetic risk factors in the sagittal plane. |
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| Keywords: | Drop landing Accelerometer Knee mechanics |
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