A fusion implant apparatus for facilitating fusion of adjacent bone structures
includes a threadless implant member which is positioned between adjacent opposed
bone structures. The implant member defines a longitudinal axis and first and second
longitudinal ends and has an outer wall which is dimensioned to engage the opposed
bone structures upon positioning therebetween in supporting relation therewith.
The outer wall defines an internal cavity for the reception of bone growth inducing
substances and includes a plurality of apertures which extend therethrough in communication
with the internal cavity to permit fusion of vertebral bone tissue. The implant
member also includes an intermediate portion which defines a cross-sectional dimension
transverse to the longitudinal axis which is greater than the respective cross-sectional
dimensions of the first and second longitudinal ends of the implant member.
