Expandable Interbodies and Related Methods

An expandable interbody comprising:

• a superior shell having a proximal end and a distal end, the superior shell defining a superior surface extending from the proximal end to the distal end configured to engage an inferior surface of a first vertebral body, the superior shell having two side walls, at least one wall having at least one angled channel;
• an inferior shell having a proximal end and a distal end, the inferior shell defining an inferior surface configured to engage a superior surface of a second vertebral body, the inferior shell having two side walls, at least one wall having at least one angled channel;
• and
• a control member comprising interlocking proximal and distal cages and an adjustment screw defining a longitudinal axis, the adjustment screw configured to engage with the proximal and distal cages;
• wherein the proximal cage comprises at least one superior lateral projection and at least one inferior lateral projection, each lateral projection configured to engage with one of the at least one angled channel of the superior and inferior shells;
• wherein the distal cage comprises a at least one superior lateral projection and at least one inferior lateral projection, each lateral projection configured to engage with one of the at least one angled channel of the superior and inferior shells,
• wherein rotation of the adjustment screw causes the distal cage to move longitudinally relative to the proximal cage, which in turn causes the interbody to expand or contract in a direction transverse to the longitudinal axis.