Ultrasound-guided interventional procedures around the shoulder.

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Abstract

[Indexed for MEDLINE] 4. Orthop Traumatol Surg Res. 2017 Feb;103(1S):S1-S10. doi: 10.1016/j.otsr.2016.11.003. Epub 2017 Jan 2. The biology of rotator cuff healing. Zumstein MA(1), Lädermann A(2), Raniga S(3), Schär MO(3). Author information: (1)Shoulder, Elbow & Orthopaedic Sports Medicine, Department of Orthopaedics and Traumatology, University Hospital Bern, Inselspital, 3010 Bern, Switzerland. Electronic address: m.zumstein@insel.ch. (2)Division of Orthopaedics and Trauma Surgery, La Tour Hospital, Av. J.D. Maillard 3, 1217 Meyrin, Switzerland. (3)Shoulder, Elbow & Orthopaedic Sports Medicine, Department of Orthopaedics and Traumatology, University Hospital Bern, Inselspital, 3010 Bern, Switzerland. Despite advances in surgical reconstruction of chronic rotator cuff (RC) tears leading to improved clinical outcomes, failure rates of 13-94% have been reported. Reasons for this rather high failure rate include compromised healing at the bone-tendon interface, as well as the musculo-tendinous changes that occur after RC tears, namely retraction and muscle atrophy, as well as fatty infiltration. Significant research efforts have focused on gaining a better understanding of these pathological changes in order to design effective therapeutic solutions. Biological augmentation, including the application of different growth factors, platelet concentrates, cells, scaffolds and various drugs, or a combination of the above have been studied. It is important to note that instead of a physiological enthesis, an abundance of scar tissue is formed. Even though cytokines have demonstrated the potential to improve rotator cuff healing in animal models, there is little information about the correct concentration and timing of the more than 1500 cytokines that interact during the healing process. There is only minimal evidence that platelet concentrates may lead to improvement in radiographic, but not clinical outcome. Using stem cells to biologically augment the reconstruction of the tears might have a great potential since these cells can differentiate into various cell types that are integral for healing. However, further studies are necessary to understand how to enhance the potential of these stem cells in a safe and efficient way. This article intends to give an overview of the biological augmentation options found in the literature. Copyright © 2016. Published by Elsevier Masson SAS. DOI: 10.1016/j.otsr.2016.11.003