Devices and methods for treating bone

A spinal system comprising:

• an upper plate having a proximal end and a distal end;
• a lower plate in opposition to the upper plate;
• a posterior support leg engaged, at the proximal end, with the upper plate and the lower plate;
• and
• an anterior support leg engaged, at the distal end, with the upper plate and the lower plate,
• wherein the anterior support leg is configured to removably engage a plunger, wherein sliding movement of the plunger moves the spinal system between a collapsed state and an expanded state, wherein the plunger extends past the posterior support leg, between the upper plate and the lower plate, to engage an inner face of the anterior support leg, and
• wherein the posterior support leg and the anterior support leg are configured to have a collapsible connection with the upper plate and the lower plate such that movement of the plunger corresponds to the upper plate and the lower plate to move towards each other in the collapsed state and move away from each other in the expanded state,
• wherein in the collapsed state, the upper endplate is generally angled relative to at least one of the anterior and posterior support legs, and
• wherein the spinal system is biased towards the expanded state.