Expandable interbody fusion device for use with posterior to lateral approach

A disc implant device comprising:

• a body comprising a series of generally cylindrical arm segments, each generally cylindrical arm segment being separated from an adjacent arm segment by a joint segment, each arm segment including a plurality of arm members comprising a plurality of rising arm members and a plurality of falling arm members;
• wherein the body comprises alternating arm segments separated by joint segments;
• wherein the arm segments include a compliant hinge mechanism structure between each respective rising arm member and falling arm member, so that each arm segment is configured to form a plurality of radially extending arms when a given arm segment of the disc implant device is axially collapsed and radially expanded along the compliant hinge mechanism structure, such that the plurality of radial arms form one or more sets of radially extending arms, adjacent segments of radially extending arms being separated by a joint segment therebetween, and
• wherein the joint segments between arm segments comprise a tongue and groove or other key and keyhole structures that mate with one another when the arm segment between respective joint segments is radially expanded and axially collapsed.