Robotic simulation of identical athletic-task kinematics on cadaveric limbs exhibits a lack of differences in knee mechanics between contralateral pairs |
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| Institution: | 1. Department of Orthopedic Surgery, Mayo Clinic, Rochester, MN, USA;2. Department of Biomedical Engineering, University of Cincinnati, Cincinnati, OH, USA;3. Sports Medicine Biodynamics Center, Division of Sports Cincinnati Children׳s Hospital Medical Center, Cincinnati, OH, USA;4. Department of Pediatrics, College of Medicine, University of Cincinnati, Cincinnati, OH, USA;5. Department of Orthopaedic Surgery, College of Medicine, University of Cincinnati, Cincinnati, OH, USA;6. The Micheli Center for Sports Injury Prevention, Boston, MA, USA;7. Mayo Clinic Biomechanics Laboratories and Sports Medicine Center, Departments of Orthopedics, Physical Medicine and Rehabilitation and Physiology & Biomedical Engineering, Mayo Clinic, Rochester and Minneapolis, MN.;1. School of Computer Science and Engineering, Korea University of Technology and Education, Cheonan, Republic of Korea;2. Department of Orthopaedic Surgery, Hallym University, Dongtan, Republic of Korea;1. School of Kinesiology, University of Michigan, Ann Arbor, MI, USA;2. Department of Biomedical Engineering, University of Michigan, Ann Arbor, MI, USA;3. Department of Orthopaedic Surgery, University of Michigan, Ann Arbor, MI, USA;4. Department of Industrial & Operations Engineering, University of Michigan, Ann Arbor, MI, USA;1. Department of Orthopaedic Surgery, Duke University Medical Center, Durham, NC, United States;2. Department of Radiology, Duke University Medical Center, Durham, NC, United States;1. Department of Mechanical Engineering and Materials Science, University of Pittsburgh, Pittsburgh, PA 15203, USA;2. Department of Orthopaedic Surgery, University of Pittsburgh, Pittsburgh, PA 15203, USA;3. Health Effects Lab Division, National Institute for Occupational Safety and Health, Morgantown, WV 26505, USA;4. Mechanical Systems Engineering, EMPA (Swiss Federal Laboratories for Materials Science and Technology), 8600 Duebendorf, Switzerland;5. Department of Industrial & Systems Engineering, Texas A&M University, College Station, TX 77843, USA;6. Department of Mechanical Engineering, Texas A&M University, College Station, TX 77843, USA |
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| Abstract: | Limb asymmetry is a known factor for increased ACL injury risk. These asymmetries are normally observed during in vivo testing. Prior studies have developed in vitro testing methodologies driven by in vivo kinematics to investigate knee mechanics relative to ACL injury. The objective of this study was to determine if mechanical side-to-side asymmetries persist in contralateral pairs during in vitro simulation testing. In vivo kinematics were recorded for male and female drop vertical jump and sidestep cutting tasks. The recorded kinematics were used to robotically simulate the motions on 7 contralateral pairs of cadaveric lower extremities specimens. ACL and MCL force, torque, and strains were recorded and analyzed for differences between contralateral pairs. There was a general lack of mechanical differences between limb sides. Adduction peak torque for the male sidestep cut movement was significantly different between limb sides (p=0.04). However, this is consistent with ACL injury mechanics in that movement in the frontal plane (abduction/adduction) increases injury risk and it is possible loading differences in this plane may have resulted from tolerances within the setup process. The findings of this study indicate that contralateral knee joints were representative of each other during biomechanical in vitro tests. In future cadaveric robotic simulations, contralateral limbs can be used interchangeably. In addition, direct comparisons of the structural behaviors of isolated conditions for contralateral knee joints can be performed. |
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| Keywords: | Knee biomechanics Contralateral pairs Side asymmetry Joint simulation Robotic knee articulation |
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