| http://www.w3.org/ns/prov#value | - In one embodiment, the end members 22, 24 and spacer member 26 are formed of a biocompatible material, such as, for example, a carbon fiber material, or non-metallic substances, including polymers or copolymers made from materials such as PEEK and UHMWPE. In further embodiments, the end members 22, 24 and spacer member 26 may be formed of other suitable biocompatible materials, such as, for exampl
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