a resorbable interbody fusion device for use in spinal fixation is disclosed . the device is composed of 25 - 100 % bioresorbable or resorbable material . the interbody fusion device of the invention can be in any convenient form , such as a wedge , screw or cage . preferably , the resorbable device of the invention is in the shape of a tapered wedge or cone , which further desirably incorporates structural features such as serrations or threads better to anchor the device in the adjoining vertebrae . the preferred device further comprises a plurality of peripheral voids and more desirably a central void space therein , which may desirably be filled with a grafting material for facilitating bony development and / or spinal fusion , such as an autologous grafting material . as the preferred material from which the resorbable interbody fusion device is manufactured is most likely to be a polymer that can produce acidic products upon hydrolytic degradation , the device preferably further includes a neutralization compound , or buffer , in sufficiently high concentration to decrease the rate of ph change as the device degrades , in order to prevent sterile abscess formation caused by the accumulation of unbuffered acidic products in the area of the implant .