An artificial intervertebral disc comprises a pair of end bodies which are provided, on their outer surfaces, with apatite layers. The disc includes a medical synthetic polymeric intermediate which is held between the end bodies through connecting members.
An apatite coated article comprising a substrate having thereon an apatite layer which is formed by flame spraying apatite powder at from about 2,000.degree. to 4,000.degree. C., and a process for producing such an apatite coated article.