“…The hydrogel prepared by combining natural polymer, synthetic polymer, and HA has achieved good results in bone repair experiments [ 25 , 26 ]. Radhakrishnan [ 27 ] prepared a hydrogel composed of alginate, chitosan, polyethylene glycol, and nHA, which showed good immunocompatibility and biocompatibility. Fu [ 28 ] developed a new three-component bionic hydrogel composite material consisting of triblock PEG-PCL-PEG copolymer, collagen, and nHA.…”