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Updated: May 29, 2026
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Athymic Rat Model for Evaluation of Engineered Anterior Cruciate Ligament Grafts
Published on: March 26, 2015
Three-dimensional engineered bone-ligament-bone constructs for anterior cruciate ligament replacement
Jinjin Ma1, Michael J Smietana, Tatiana Y Kostrominova
1Department of Mechanical Engineering, University of Michigan, Ann Arbor, Michigan, USA.
Tissue Engineering. Part A
|September 10, 2011
Summary
This study engineered a bone-ligament-bone tissue construct for anterior cruciate ligament (ACL) replacement. The engineered ACL grafts showed promising structural and functional integration in sheep models.
Area of Science:
- Biomedical Engineering
- Orthopedic Surgery
- Tissue Engineering
Background:
- Anterior cruciate ligament (ACL) injuries are common, necessitating graft reconstruction due to poor natural healing.
- Current ACL reconstruction methods face challenges with graft integration and long-term functionality.
Purpose of the Study:
- To develop and evaluate a multi-phasic, bone-ligament-bone tissue-engineered construct for ACL replacement.
- To assess the in vivo integration, structural, and functional properties of the engineered construct.
Main Methods:
- Utilized bone marrow stromal cells to create tissue-engineered constructs in a sheep model.
- Implanted constructs for 6 months and analyzed their microstructural, mechanical, and biological characteristics.
Main Results:
- Constructs demonstrated organized microstructure, bone integration, functional enthesis, vascularization, and innervation.
- Engineered grafts achieved significant mechanical properties, nearing native ACL stiffness and viscoelasticity.
- Increased collagen content and structural alignment were observed.
Conclusions:
- The developed tissue-engineered ACL construct shows potential for physiologically relevant integration and function post-implantation.
- This approach offers a viable alternative for ACL replacement, addressing limitations of current treatments.
