A height-adjustable vertebral spacer is described. The spacer has a superior member and an inferior member. The superior member has a superior vertebral interface and an inferior nesting interface. The superior vertebral interface includes angled teeth, and the inferior nesting interface has one or more lateral walls with one or more rows of slits formed therein. The inferior member has an inferior vertebral interface and one or more lateral walls with one or more rows of ridges protruding inwardly from the one or more lateral walls. Each of the ridges has an angled bottom side and a flat upper side that is perpendicular to the lateral wall from which it protrudes. When the superior member is mated with the inferior member the one or more ridges of the inferior member are oriented to mate with the one or more slits of the superior member.
