There have been several biomechanical studies comparing the strength and lengthening of fixed versus suspensory loop devices in a laboratory environment. In particular, assessment is made of the lengthening of the suspensory loop when subject to repetitive cyclic loading and also of ultimate failure when subject to load to failure testing. Varying results have been reported. Petre et al showed 4 suspensory loops had ultimate failure tolerances that would exceed the forces that an ACL graft would be subjected to. However, on repetitive cyclic testing one of the adjustable length suspensory loops stretched in excess of 3mm which was beyond the threshold which would be considered a clinical failure.