Abstract: An adjustable orthopedic implant can include a neck assembly, a stem assembly, and a drive assembly having a first portion coupled to the neck assembly and a second portion coupled to the stem assembly. The drive assembly can include an actuator configured to rotate in response to the actuation signal, and a threaded rod coupled to the actuator and configured to rotate in response to rotation of the actuator. The threaded rod can engage a threaded receptacle of the stem assembly such that rotation of the threaded rod in a first direction urges the neck assembly and the stem assembly closer together, and rotation of the threaded rod in a second, opposite direction urges the neck assembly and the stem assembly further apart.

Abstract: A self-healing polymer composition includes a polymer backbone having at least one amine terminated end group. The polymer backbone is selected from the group consisting of a polymerized siloxane and an aliphatic polyether and preferably polydimethylsiloxane. A cross-linker is selected from the group consisting of a 1,3,5-triarylbenzene, a triaryl-amine and 2,4,6-trichloro-1,3,5-benzenetricarbaldehyde, and preferably is 1,3,5-tris-(4-formylphenyl) benzene.