AccScience Publishing / IJB / Online First / DOI: 10.36922/IJB025120100
REVIEW ARTICLE
Early Access

Hierarchical 3D-printed scaffolds for osteochondral regeneration: From Bio-mimetic design to functional integration

Qi Wang1 Wei Zhu2 Ruoying Wang1 Xisheng Weng2*
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1 Peking Union Medical College, Beijing 100730, P.R. China.
2 Department of Orthopedics, Peking Union Medical College Hospital, Peking Union Medical College & Chinese Academy of Medical Sciences, Beijing 100730, P. R. China
Received: 22 March 2025 | Accepted: 28 April 2025 | Published online: 28 April 2025
© 2025 by the Author(s). This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution 4.0 International License ( https://creativecommons.org/licenses/by/4.0/ )
Abstract

Osteochondral (OC) defects, characterized by the structural and functional disruption of articular cartilage and subchondral bone, present significant clinical challenges due to their limited intrinsic regenerate capacity. Scaffold-based tissue engineering has paved a way for OC defect treatment yet remains challenge to restore the complex structure and composition of native OC tissue. Recent advances in 3D printing enable the fabrication of layered anisotropic scaffolds that aim to biomimetically recapitulate the native tissue's zonal properties through precise hierarchical design. High-resolution fabrication techniques facilitate the construction of delicate microarchitectures, while advanced bioprinting methods allow for the incorporation of bioactive factors and cells into the scaffold. Emphasis is placed on four scaffold design paradigms in this review: composite gradients, microarchitectural patterning, biochemical gradients, and cellular heterogeneity. Moreover, key properties of multilayered scaffolds are discussed, including mechanical performance, interfacial strength, and degradation behavior. In addition, several obstacles associated with the in vivo application of scaffolds are discussed, providing insights for future clinical transformation of OC defects treatment.

Keywords
Osteochondral regeneration
3D-printed scaffold
Osteoarthritis
Tissue engineering
Biomaterials
Regenerative medicine
Funding
This work was supported by the Natural Science Foundation of Beijing, China (Grant No. 7232119), the Beijing Natural Science Foundation (Grant No. L232006), and the National Natural Science Foundation Youth Fund (Grant No. 82102582). The authors gratefully acknowledge these funding sources for their financial support.
Conflict of interest
There are no conflicts to declare.
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International Journal of Bioprinting, Electronic ISSN: 2424-8002 Print ISSN: 2424-7723, Published by AccScience Publishing