Intervertebral spacers are provided for use in orthopedic treatment of spinals defects. The intervertebral spacer is formed of a shape memory polymer. The spacer can be fabricated into a desired configuration and then deformed into an alternative or deformed configuration. Cooling the deformed spacer...http://www.google.com/patents/US7828845?utm_source=gb-gplus-sharePatent US7828845 - Laterally expanding intervertebral fusion device