Anterior cruciate ligament (ACL) reconstructive surgeries are often successful at improving joint stability, but patients have a highly elevated rik for developing early onset osteoarthritis (OA). It is not well understood why OA develops in these patients, or how one can best plan a treatment strategy to mitigate the risk for OA. This is a very challenging question to answer empirically, since prospective studies require large subject numbers and many years to decipher. Current computational models in biomechanics are ill-suited to solve this problem because they decouple behavior that occurs at the macro (whole body) and micro (tissue mechanics) scales. Hence, a new multi-scale computational construct is being formulated to examine the inherent coupling that exists between musculoskeletal dynamics and soft tissue mechanics during gait. This construct is used to gain insights into the key surgical factors that can affect cartilage contact stresses after ACL reconstruction, which are believed to predicate osteoarthritic changes to the joint. The three aims of the study are to: 1) Assess effects of ACL graft stiffness, pre-tension and tunnel architecture on intra-operative assessments of knee laxity, 2) Investigate the coupled influence of surgical factors and muscle forces on in vivo knee mechanics as measured using dynamic MRI, 3) Investigate the multi-scale biomechanical behavior of reconstructed knees during human locomotion.
These aims are used to test the hypothesis that articular cartilage contact stress magnitudes and location vary significantly with active muscle loading, and are also highly sensitive to the position and orientation of the tunnels used to reconstruct the ACL. The results of these studies are important for informing clinical approaches that can best mitigate the risk fo OA following ligament injury and surgical repair.

Public Health Relevance

Anterior cruciate ligament (ACL) tears are a common injury. While ACL reconstructive surgery can restore joint stability, the long-term prognosis is not nearly as good with many patients exhibiting signs of osteoarthritis in a few years. This study uses computer models and magnetic resonance imaging to investigate surgical factors that may best restore normal knee mechanics and mitigate long-term risk for OA.

Agency
National Institute of Health (NIH)
Institute
National Institute of Biomedical Imaging and Bioengineering (NIBIB)
Type
Research Project--Cooperative Agreements (U01)
Project #
5U01EB015410-02
Application #
8707452
Study Section
Special Emphasis Panel (ZEB1-OSR-C (J2))
Program Officer
Peng, Grace
Project Start
2013-08-01
Project End
2017-07-31
Budget Start
2014-08-01
Budget End
2015-07-31
Support Year
2
Fiscal Year
2014
Total Cost
$472,441
Indirect Cost
$88,065
Name
Rehabilitation Institute of Chicago
Department
Type
DUNS #
068477546
City
Chicago
State
IL
Country
United States
Zip Code
60611
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Vignos, Michael F; Kaiser, Jarred M; Baer, Geoffrey S et al. (2018) American Society of Biomechanics Clinical Biomechanics Award 2017: Non-anatomic graft geometry is linked with asymmetric tibiofemoral kinematics and cartilage contact following anterior cruciate ligament reconstruction. Clin Biomech (Bristol, Avon) 56:75-83
Kaiser, Jarred M; Vignos, Michael F; Kijowski, Richard et al. (2017) Effect of Loading on In Vivo Tibiofemoral and Patellofemoral Kinematics of Healthy and ACL-Reconstructed Knees. Am J Sports Med 45:3272-3279
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Kaiser, Jarred; Vignos, Michael F; Liu, Fang et al. (2016) American Society of Biomechanics Clinical Biomechanics Award 2015: MRI assessments of cartilage mechanics, morphology and composition following reconstruction of the anterior cruciate ligament. Clin Biomech (Bristol, Avon) 34:38-44
Smith, Colin R; Vignos, Michael F; Lenhart, Rachel L et al. (2016) The Influence of Component Alignment and Ligament Properties on Tibiofemoral Contact Forces in Total Knee Replacement. J Biomech Eng 138:021017
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Erdemir, Ahmet; Guess, Trent M; Halloran, Jason P et al. (2016) Commentary on the integration of model sharing and reproducibility analysis to scholarly publishing workflow in computational biomechanics. IEEE Trans Biomed Eng 63:2080-2085

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