< Research

Investigation of Damage in Medial Collateral Ligaments

Zheying Guo · Raffaella De Vita · Frances M. Davis
Virginia Tech


Abstract. The effects of consecutive and gradually increasing strain on the mechanical behavior of rat medial collateral ligaments (MCLs) were studied to characterize and understand the damage evolution process. Displacement-controlled tensile tests were conducted on femur-MCL-tibia complexes (FMTCs) harvested from Sprague Dawley rats. Each FMTC was loaded to a given displacement, unloaded, and re-loaded to another increasing displacement several times until complete failure occurred. Two different phenomena were observed which indicated the initiation and propagation of damage: the elongation of the toe region and decrease in modulus of the linear region.