Local therapy involving injectable hydrogel systems loaded with doxorubicin (DOX) has garnered significant attention in the realm of osteosarcoma (OS) research. Nevertheless, it has been noted that the local delivery of high-dose DOX exerts a pronounced inhibitory impact on osteogenesis, which is detrimental to the restoration of functional capabilities after OS treatment. To address this challenge, we have designed a self-assembled injectable hydrogel system that integrates photodynamic and chemodynamic therapy, aiming to enhance efficacy while mitigating adverse effects on osteogenic differentiation. In this study, an injectable sodium alginate (SA) hydrogel was fabricated by encapsulating titanium carbide powder (Ti