(C. A. Engh, Moore) Alexandria; (Vinh) Washington, D.C.; (G. A. Engh) Alexandria, Virginia.Investigation performed at Anderson Orthopaedic Research Institute, Alexandria, and Armed Forces Institute of Pathology, Washington, D.C.*One or more of the authors has received or will receive benefits for personal or professional use from a commercial party related directly or indirectly to the subject of this article. No funds were received in support of this study.(C. A. Engh, Moore, G. A. Engh) Anderson Orthopaedic Research Institute, P.O. Box 7088, Alexandria, Virginia 22307.(Vinh) Armed Forces Institute of Pathology, 14th and Alaska Avenue, N.W., Washington, D.C. 20306.