The influence of internal and external tibial rotation offsets on knee joint and ligament biomechanics during simulated athletic tasks

Content Provider	Scilit
Author	Bates, Nathaniel A. Nesbitt, Rebecca J. Shearn, Jason T. Myer, Gregory D. Hewett, Timothy E.
Copyright Year	2018
Description	Journal: Clinical Biomechanics Background Following anterior cruciate ligament injury and subsequent reconstruction transverse plane tibiofemoral rotation becomes underconstrained and overconstrained, respectively. Conflicting reports exist on how rotations influence loading at the knee. This investigation aimed to determine the mechanical effects of internal and external tibial rotation offsets on knee kinematics and ligament strains during in vitro simulations of in vivo recorded kinematics. Method A 6-degree-of-freedom robotic manipulator arm was used to articulate 11 cadaveric tibiofemoral joint specimens through simulations of four athletic tasks produced from in vivo recorded kinematics. These simulations were then repeated with 4° tibial rotation offsets applied to the baseline joint orientation. Findings Rotational offsets had a significant effect on peak posterior force for female motion simulations (P < 0.01), peak lateral force for most simulated tasks (P < 0.01), and peak anterior force, internal torque, and flexion torque for sidestep cutting tasks (P ≤ 0.01). Rotational offsets did not exhibit statistically significant effects on peak anterior cruciate ligament strain (P > 0.05) or medial collateral ligament strain (P > 0.05) for any task. Interpretation Transverse plane rotational offsets comparable to those observed in anterior cruciate ligament deficient and reconstructed patients alter knee kinetics without significantly altering anterior cruciate ligament strain. As knee degeneration is attributed to abnormal knee loading profiles, altered transverse plane kinematics may contribute to this. However, altered transverse plane rotations likely play a limited role in anterior cruciate ligament injury risk as physiologic offsets failed to significantly influence anterior cruciate ligament strain during athletic tasks.
Related Links	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5835205/pdf http://www.clinbiomech.com/article/S026800331830055X/pdf
Ending Page	116
Page Count	8
Starting Page	109
ISSN	02680033
e-ISSN	18791271
DOI	10.1016/j.clinbiomech.2018.01.019
Journal	Clinical Biomechanics
Volume Number	52
Language	English
Publisher	Elsevier BV
Publisher Date	2018-02-01
Access Restriction	Open
Subject Keyword	Journal: Clinical Biomechanics Anterior Cruciate Ligament; Medial Collateral Ligament; Jump Landing; Robotic Manipulator; Athletic Task Simulation
Content Type	Text
Resource Type	Article
Subject	Orthopedics and Sports Medicine Biophysics Sports Science