A review paper by scientists at the University of Oxford discussed possible benefits of using humanoid musculoskeletal robots and soft robotic systems as bioreactor platforms in producing clinically useful tendon constructs.
The new review paper, published on 15 Sep 2022 in the journal Cyborg and Bionic Systems, summarizes current trends in tendon tissue engineering and discusses how conventional bioreactors are unable to provide physiologically relevant mechanical stimulation given that they largely rely on uniaxial tensile stages. The paper then highlights musculoskeletal humanoid robots and soft robotic systems as platforms for providing physiologically relevant mechanical stimulation that could overcome this translational gap.
Tendon and soft tissue injuries are a growing social and economic problem, with the tendon repair market in the United States being estimated at $ 1.5 billion USD. Tendon repair surgeries have high rates of revision, with upwards of 40% of rotator cuff repairs failing post-operatively. Production of engineered tendon grafts for clinical use is a potential solution for this challenge. Conventional tendon bioreactors mainly provide uniaxial tensile stimulation. The lack of systems which recapitulate in vivo tendon loading is a major translational gap.
The human body provides tendons with three-dimensional mechanical stress in the form of tension, compression, torsion, and shear. Current research suggests that healthy native tendon tissue requires multiple types and directions of stress. Advanced robotic systems such as musculoskeletal humanoids and soft robotics promising platforms that may be able to mimic in vivo tendon loading explained author Iain Sander, a researcher at the University of Oxford with the Soft Tissue Engineering Research Group.
Musculoskeletal humanoid robots were initially designed for applications such as crash test dummies, prostheses, and athletic enhancement. They attempt to imitate human anatomy by having similar body proportions, skeletal structure, muscle arrangement, and joint structure. Musculoskeletal humanoids such as Roboy and Kenshiro use tendon-driven systems with myorobotic actuators that mimic human neuromuscular tissue. Myorobotic units consist of a brushless dc motor which generates tension like human muscles, attachment cables which act as the tendon unit, and a motor driver board with a spring encoder, which act as the neurologic system by sensing variables including tension, compression, muscle length, and temperature. Proposed advantages of musculoskeletal humanoids include the ability to provide multiaxial loading, potential for loading in consideration of human movement patterns, and provision of loading magnitudes comparable to in vivo forces. One recent study has demonstrated the feasibility of growing human tissue on a musculoskeletal humanoid robot for tendon engineering.
Biohybrid soft robotics is focused on developing biomimetic, compliant robotic systems which permit adaptive, flexible interactions with unpredictable environments. These robotic systems are actuated through a number of modalities, including temperature, pneumatic and hydraulic pressure, and light. They are made of soft materials including hydrogels, rubber, and even human musculoskeletal tissue. These systems are already being used to provide mechanical stimulation to smooth muscle tissue constructs and have been implemented in vivo in a porcine model. These systems are attractive for tendon tissue engineering given that: i) their flexible, compliant properties allow them wrap around anatomic structures, mimicking the configuration of native tendon ii) they are capable of providing multiaxial actuation and iii) a number of the techniques used in soft robotics overlap with current tendon tissue engineering practices.Looking forward, the team envision advanced robotic systems as platforms which will provide physiologically relevant mechanical stimulus to tendon grafts prior to clinical use. There are a number of challenges to consider as advanced robotic systems are implemented. Firstly, it will be important for future experiments to compare technologies proposed in this review to conventional bioreactors. With development of systems capable of providing multiaxial loading, it will be important to find methods for quantifying strain in 3D. Finally, advanced robotic systems will need to be more affordable and accessible for widespread implementation.
An increasing number of research groups are showing that it is feasible to use advanced robotics in combination with living cells and tissues for tissue engineering and bioactuation applications. We are now at an exciting stage where we can explore the different possibilities of incorporating these technologies in tendon tissue engineering and examine whether they can really help improve the quality of engineered tendon grafts, said Pierre-Alexis Mouthuy, the review articles senior author. In the long term, these technologies have potential to improve quality of life for individuals, by decreasing pain and risk of tendon repair failure, for healthcare systems, by reducing the number of revision surgeries, and for the economy, by improving workplace productivity and lowering healthcare costs.
Authors of the paper include Iain Sander, Nicole Dvorak, Julie Stebbins, Andrew J Carr, Pierre-Alexis Mouthuy.
This work has been completed with the financial support of the United 16 Kingdoms Engineering and Physical Sciences Research Council (project number: 17 P/S003509/1), and the Rhodes Trust.
The paper, " Advanced Robotics to Address the Translational Gap in Tendon Engineering," was published in the journal Cyborg and Bionic Systems on 15 Sep 2022, at DOI: https://doi.org/10.34133/2022/9842169.
Reference: Iain L. Sander1,2*, Nicole Dvorak1 , Julie A. Stebbins1,2, Andrew J. Carr1 , Pierre-Alexis Mouthuy1,3
Title of original paper: Advanced Robotics to Address the Translational Gap in TendonEngineering
Journal: Cyborg and Bionic Systems
DOI: https://spj.sciencemag.org/journals/cbsystems/2022/9842169/
Affiliations:
A brief introduction about authors
Iain Sander:
Iain Sander is a graduate student in the Mouthuy Soft Tissue Research Group at the University of Oxford, where he completed his M.Sc in Musculoskeletal Sciences as a Rhodes Scholar. He is currently completing his medical training at the University of Alberta in Canada. His research interests include clinical gait analysis, regenerative medicine, tendon injury, and tendon tissue engineering.
Nicole Dvorak:
Nicole Dvorak a graduate student in the Mouthuy Soft Tissue Research Group at the University of Oxford and is currently completing her D.Phil in Musculoskeletal Sciences funded through the NIHR Oxford Biomedical Research Centre. She previously completed an M.Sc. in Medical and Pharmaceutical Biotechnology at the IMC FH Krems, Austria. Her research interests include tissue engineering and regenerative medicine.
Julie Stebbins:
Dr. Julie Stebbins is a clinician-scientist and director of the Oxford Gait Laboratory. She has published extensively on clinical gait analysis, helped develop the Oxford Foot Model for gait analysis, and serves as Deputy Editor of Gait and Posture. Julie has been sought out internationally for her expertise in clinical gait analysis and helped set up the first gait lab in Ethiopia.
Andrew Carr:
Prof. Carr is the former department head of the University of Oxfords Nuffield Department of Orthopaedics, Rheumatology, and Musculoskeletal Sciences. He is an orthopaedic surgeon who helped develop the Oxford Knee partial knee replacement, which has been implanted in over 2 million patients globally. He has authored over 450 papers, including more than 25 which have been featured in the Lancet and BMJ.
Pierre-Alexis Mouthuy
Prof. Pierre-Alexis Mouthuy is an Associate Professor in the University of Oxfords Nuffield Department of Orthopaedics, Rheumatology, and Musculoskeletal Sciences, where he leads the Mouthuy Soft Tissue Research Group. He leads the multidisciplinary Humanoid Bioreactor Project, aimed at growing human tendon on musculoskeletal humanoid robots, and has secured over 1.2 million GBP in funding for this project. He is a recognized researcher in the fields of biomaterials, tissue engineering, and robotics.
Cyborg and Bionic Systems
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