Zhou Ge, Geng Xiao, Wang Xinguang, Yang Xule, Li Feng, Li Zijian, Xu Liju, Qiu Dong, Tian Hua
Department of Orthopedics, Engineering Research Center of Bone and Joint Precision Medicine, Peking University Third Hospital, Beijing, 100191, China.
Beijing National Laboratory for Molecular Sciences, Laboratory of Polymer Physics and Chemistry, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China.
Adv Healthc Mater. 2025 Jul;14(17):e2500253. doi: 10.1002/adhm.202500253. Epub 2025 May 26.
Load-bearing cartilage lesions are progressive, so focal lesions require rapid repair to support loading; otherwise, they may generate degeneration of a large area of cartilage till worse osteoarthritis occurs. Replacing the focally lesioned cartilage with synthetic grafts can instantly recover the damaged cartilage's load-bearing capacity, but have issues with mismatched mechanical properties and weak cartilage integration. Inspired by natural osteochondral tissue, a hydrogel-titanium scaffold (gel-Ti) di-block patch with a robust interlocking interface is developed. In this osteochondral tissue-mimicking gel-Ti patch, the hydrogel layer offers mechanical properties comparable to those of native cartilage, whereas the titanium scaffold layer with pores for bone ingrowth integrates the patch with subchondral bone and thus host cartilage. Consequently, the gel-Ti patch achieves prompt and effective repair of load-bearing cartilage defects in rabbit and canine models, in striking contrast to the dry and rigid ultra-high-molecular-weight polyethylene (UHMWPE) patch that induces progressive cartilage destruction. Moreover, the gel-Ti patch shows favorable chondroprotective effects, durable mechanical properties, and long-term safety. This work reveals a new approach to address the urgent clinical need to rapidly restore focal cartilage damage to withstand loading, thereby preventing further worsening of cartilage and joints.
承重软骨损伤具有进展性,因此局部损伤需要快速修复以支持负荷;否则,它们可能导致大面积软骨退变,直至发展为更严重的骨关节炎。用合成移植物替代局部损伤的软骨可立即恢复受损软骨的承重能力,但存在机械性能不匹配和软骨整合薄弱的问题。受天然骨软骨组织的启发,开发了一种具有坚固互锁界面的水凝胶-钛支架(gel-Ti)双嵌段贴片。在这种模仿骨软骨组织的gel-Ti贴片中,水凝胶层提供与天然软骨相当的机械性能,而带有促进骨长入孔隙的钛支架层则将贴片与软骨下骨以及宿主软骨整合在一起。因此,gel-Ti贴片在兔和犬模型中实现了对承重软骨缺损的快速有效修复,这与导致软骨进行性破坏的干燥坚硬的超高分子量聚乙烯(UHMWPE)贴片形成了鲜明对比。此外,gel-Ti贴片显示出良好的软骨保护作用、持久的机械性能和长期安全性。这项工作揭示了一种新方法,可满足快速修复局部软骨损伤以承受负荷的迫切临床需求,从而防止软骨和关节进一步恶化。
Knee Surg Sports Traumatol Arthrosc. 2011-9-11
J Orthop Translat. 2025-7-16