Davis Sarah, Roldo Marta, Blunn Gordon, Tozzi Gianluca, Roncada Tosca
School of Pharmacy and Biomedical Sciences, University of Portsmouth, Portsmouth, United Kingdom.
Zeiss Global Centre, School of Mechanical and Design Engineering, University of Portsmouth, Portsmouth, United Kingdom.
Front Bioeng Biotechnol. 2021 Jan 27;9:603408. doi: 10.3389/fbioe.2021.603408. eCollection 2021.
Articular cartilage is a highly specialised connective tissue of diarthrodial joints which provides a smooth, lubricated surface for joint articulation and plays a crucial role in the transmission of loads. cartilage is subjected to mechanical stimuli that are essential for cartilage development and the maintenance of a chondrocytic phenotype. Cartilage damage caused by traumatic injuries, ageing, or degradative diseases leads to impaired loading resistance and progressive degeneration of both the articular cartilage and the underlying subchondral bone. Since the tissue has limited self-repairing capacity due its avascular nature, restoration of its mechanical properties is still a major challenge. Tissue engineering techniques have the potential to heal osteochondral defects using a combination of stem cells, growth factors, and biomaterials that could produce a biomechanically functional tissue, representative of native hyaline cartilage. However, current clinical approaches fail to repair full-thickness defects that include the underlying subchondral bone. Moreover, when tested , current tissue-engineered grafts show limited capacity to regenerate the damaged tissue due to poor integration with host cartilage and the failure to retain structural integrity after insertion, resulting in reduced mechanical function. The aim of this review is to examine the optimal characteristics of osteochondral scaffolds. Additionally, an overview on the latest biomaterials potentially able to replicate the natural mechanical environment of articular cartilage and their role in maintaining mechanical cues to drive chondrogenesis will be detailed, as well as the overall mechanical performance of grafts engineered using different technologies.
关节软骨是滑膜关节的一种高度特化的结缔组织,它为关节活动提供光滑、有润滑作用的表面,并在负荷传递中起关键作用。软骨受到对软骨发育和软骨细胞表型维持至关重要的机械刺激。由创伤性损伤、衰老或退行性疾病引起的软骨损伤会导致抗负荷能力受损以及关节软骨和下方软骨下骨的渐进性退变。由于该组织因其无血管性质而自我修复能力有限,恢复其力学性能仍然是一项重大挑战。组织工程技术有潜力通过结合干细胞、生长因子和生物材料来治愈骨软骨缺损,这些材料可以产生具有生物力学功能的组织,类似于天然透明软骨。然而,目前的临床方法无法修复包括下方软骨下骨在内的全层缺损。此外,在测试时,由于与宿主软骨整合不良以及植入后无法保持结构完整性,目前的组织工程移植物显示出再生受损组织的能力有限,导致机械功能降低。本综述的目的是研究骨软骨支架的最佳特性。此外,还将详细概述可能能够复制关节软骨自然力学环境的最新生物材料及其在维持机械信号以驱动软骨形成中的作用,以及使用不同技术制造的移植物的整体力学性能。