Mechanics and differential healing outcomes of small and large defect injuries of the tendon-bone attachment in the rat rotator cuff.

Autor: Sullivan AL; Department of Biomedical Engineering, University of Delaware, Newark, DE, USA., Locke RC; Department of Biomedical Engineering, University of Delaware, Newark, DE, USA., Klink RK; Department of Bioengineering, University of Utah, Salt Lake City, UT, USA., Leek CC; Department of Biomedical Engineering, University of Delaware, Newark, DE, USA.; Department of Orthopaedic Surgery, Michigan Medicine, Ann Arbor, MI, USA., Carpenter JE; Department of Orthopaedic Surgery, Michigan Medicine, Ann Arbor, MI, USA., Killian ML; Department of Biomedical Engineering, University of Delaware, Newark, DE, USA.; Department of Orthopaedic Surgery, Michigan Medicine, Ann Arbor, MI, USA.
Jazyk: angličtina
Zdroj: Connective tissue research [Connect Tissue Res] 2023 May; Vol. 64 (3), pp. 262-273. Date of Electronic Publication: 2022 Dec 16.
DOI: 10.1080/03008207.2022.2152334
Abstrakt: Introduction: Rotator cuff tear size affects clinical outcomes following rotator cuff repair and is correlated with the risk of recurrent tendon defects. This study aimed to understand if and how the initial defect size influences the structural and mechanical outcomes of the injured rotator cuff attachment in vivo.
Methods: Full-thickness punch injuries of the infraspinatus tendon-bone attachment in Long Evans rats were created to compare differences in healing outcomes between small and large defects. Biomechanical properties, gross morphology, bone remodeling, and cell and tissue morphology were assessed at both 3- and 8-weeks of healing.
Results: At the time of injury (no healing), large defects had decreased mechanical properties compared to small defects, and both defect sizes had decreased mechanical properties compared to intact attachments. However, the mechanical properties of the two defect groups were not significantly different from each other after 8-weeks of healing and significantly improved compared to no healing but failed to return to intact levels. Local bone volume at the defect site was higher in large compared to small defects on average and increased from 3- to 8-weeks. In contrast, bone quality decreased from 3- to 8-weeks of healing and these changes were not dependent on defect size. Qualitatively, large defects had increased collagen disorganization and neovascularization compared to small defects.
Discussion: In this study, we showed that both large and small defects did not regenerate the mechanical and structural integrity of the intact rat rotator cuff attachment following healing in vivo after 8 weeks of healing.
Databáze: MEDLINE
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