The BIOLOX®OPTION System is intended for use either for cup revision or ball head exchange for in situ prosthesis stems. The femoral heads and sleeves are designed specifically for use with United Orthopedic femoral stems. Benefits of the BIOLOX® OPTION System include high surgical flexibility with various head sizes and neck lengths, adaptation to a new stem taper or mildly damaged stem taper, a low-wear bearing option in revision cases, and diamond-like hardness to resist third-body wear.  The range of motion is unaffected with the sleeve