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| Although many
ideas for disc replacements have been proposed, artificial disc prosthesis
can be grouped into two categories: 1. Nuclear Prosthesis - These implants aim to replace a damaged or herniated nucleus pulposus. 2. Total Disc Prosthesis - These implants aim to replace the entire disc while maintaining motion. Below is a list of artificial discs which are currently either in clinical use or in a developmental stage. PDN Category - Nuclear Prosthesis Company - Raymedica Inc., Bloomington, Minnesota Status - Clinical Use in Europe and Saudi Arabia Concept - Hydrogel core in polyethylene jacket SB Charité Artificial Disc Category - Total Disc Prosthesis Company - Waldemar Link, Hamburg, Germany; Link Spine Group, Branford, Connecticut USA Status - Clinical use in Europe, Asia, Canada and Latin America. US clinical IDE study underway. Concept - Cobalt Chrome endplates with porous coated surfaces and biconvex polyethylene sliding core. Acroflex TDR Category - Total Disc Prosthesis Company - Johnson and Johnson/Depuy/Acromed Status - Clinical trials in Australia Concept - Titanium endplates and biologic grade rubber core Spring Disc Category - Total Disc Prosthesis Company - Medtronic Sofamor Danek Status - Animal studies Concept - All metal implant with internal spring |
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