1 Interrelation of creep and relaxation: a modeling approach for ligaments by R. S. Lakes § and R. Vanderby ¶ University of Wisconsin, Madison § Department of Engineering Physics § Rheology Research Center 147 Engineering Research Building 1500 Engineering Drive Madison, WI 53706-1687 §¶ Biomedical Engineering Program and ¶ Division of Orthopedic Surgery Madison, WI 53792-3228 J Biomech. Engineering, 121, 612-615, Dec. (1999). Key Words: Ligament, viscoelasticity, creep, relaxation.