1. Comparison of the Wear Rates of Twenty-eight and Thirty- two-Millimeter Femoral Heads on Cross-Linked Polyethylene Acetabular Cups in a Wear Simulator by Juan C. Hermida, Arnie Bergula, Peter Chen, Clifford W. Colwell, and Darryl D. D'Lima J Bone Joint Surg Am Volume 85(12):2325-2331 December 1, 2003 ©2003 by The Journal of Bone and Joint Surgery, Inc.

2. Graph of the wear rates over time showing a near linear increase in wear with number of cycles for all groups of liners. Juan C. Hermida et al. J Bone Joint Surg Am 2003;85:2325- 2331 ©2003 by The Journal of Bone and Joint Surgery, Inc.

3. Magnified (×20) view of the dome of the articular surfaces of tested liners. Juan C. Hermida et al. J Bone Joint Surg Am 2003;85:2325- 2331 ©2003 by The Journal of Bone and Joint Surgery, Inc.

4. A nominally cross-linked 32-mm liner dome (32-0) after five million cycles of testing with obliteration of machining marks. Juan C. Hermida et al. J Bone Joint Surg Am 2003;85:2325- 2331 ©2003 by The Journal of Bone and Joint Surgery, Inc.

5. An elevated cross-linked 32-mm liner dome (32-X) before testing. Juan C. Hermida et al. J Bone Joint Surg Am 2003;85:2325- 2331 ©2003 by The Journal of Bone and Joint Surgery, Inc.

6. An elevated cross-linked 32-mm liner dome (32-X) after five million cycles of testing, still showing machining marks. Juan C. Hermida et al. J Bone Joint Surg Am 2003;85:2325- 2331 ©2003 by The Journal of Bone and Joint Surgery, Inc.