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Chelsey L. Dunham (1), Heiko Steenbock (2), Jürgen Brinckmann (2,3), Alex J. Reiter (4), Ryan M. Castile (4), Aaron M. Chamberlain (5), Spencer P. Lake (1,4,5)
Journal of Orthopaedic Research, 39, Issue 8, August 2021: 1800-1810. DOI: 10.1002/jor.24781
Elbow; Post-traumatic Contracture; Collagen Crosslinks; Capsule; Lateral Collateral Ligament
Post-traumatic joint contracture (PTJC) in the elbow is a biological problem with functional consequences. Restoring elbow motion after injury is a complex challenge because contracture is a multi-tissue pathology. We previously developed an animal model of elbow PTJC using Long-Evans rats and showed that the capsule and ligaments/cartilage were the primary soft tissues that caused persistent joint motion loss. The objective of this study was to evaluate tissue-specific changes within the anterior capsule and lateral collateral ligament (LCL) that led to their contribution to elbow contracture. In our rat model of elbow PTJC, a unilateral surgery replicated damage that commonly occurs due to elbow dislocation. Following surgery, the injured limb was immobilized for 42 days. The capsule and LCL were evaluated after 42 days of immobilization or 42 days of immobilization followed by 42 days of free mobilization. We evaluated extracellular matrix protein biochemistry, non-enzymatic collagen crosslink content, tissue volume with contrast-enhanced micro-computed tomography, and tissue mechanical properties. Increased collagen content, but not collagen density, was observed in both injured limb capsules and LCLs, which was consistent with the increased tissue volume. Injured limb LCLs exhibited decreased normalized maximum force, and both tissues had increased immature collagen cross-links compared to control. Overall, increased tissue volume and immature collagen crosslinks in the capsule and LCL drive their contribution to elbow contracture in our rat model.
Dragonfly was used to draw regions-of-interest throughout the z-stack of images for each limb to calculate LCL total volume.
(1) Department of Biomedical Engineering, Washington University in St. Louis, MO
(2) Institute of Virology and Cell Biology, University of Lübeck, Germany
(3) Department of Dermatology, University of Lübeck, Germany
(4) Department of Mechanical Engineering, Washington University in St. Louis, MO
(5) Department of Orthopaedic Surgery, Washington University in St. Louis, MO
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