OBJECTIVE:To summarize clinical application of various spinal implants to explore the effect of fixator implantation in spine or limbs on MRI.METHODS:A computer-based online search of PubMed database(http://www.ncbi.nlm.nih.gov/PubMed)and CNK1(www.cnki.net/index.htm)was performed to search related articles with the key words"spinal,implants,MRI"in English and Chinese.Articles related with spinal implants and MRI were selected,published in recently or in authoritative journals in the same field.Repetitive or outdated articles were excluded.Finally,24 articles were included RESULTS:During spinal reconstruction,autologous lilac bone block and fibula have been commonly used as bone graft.However.bone graft acquisition frequently causes 20%-30%donor region complication and long-term donor pain.Therefore,allogenic bone and titanium mesh have been used to replace autologous bone graft However,due to low fusion rate and disease transmission caused by allogenic bone,titanium mesh bone graft has become a focus MRI detection shows that nickel,cobalt and iron have large shadow,and titanium alloy has the smallest shadow.Spinal cord and intraspinal structures are clearly displayed on sagittal T1 and T2 weighted and axial T1-weighted images.Vertebral plate clamp has large shadow,which affects observation of structures around the vertebral plate and the intraspinal structures.Pedicle screws have large shadow,which mainly affects observations of lateral vertebral canal,vertebral artery,intervertebral foramen,spinal nerve and posterior-laterally exserted intervertebral disk.CONCLUSION:There remain no uniform standards or favorable results,which are varied in patients with difierent disease conditions,economic conditions,and in different doctors.Titanium is the best implant for MRI,and implant long axis should be accordant with main field.Titanium alloy implant in the spine should utilize fast spin echo,short echo time,and minimize TE.The diagnosis should consider the shadow in combination with clinical manifestations.