The only clinical study comparing the loops was published by Boyle et al in 2015. In this retrospective study, the results of 188 patients were compared for 73 patients with an adjustable suspensory loop and 115 with a fixed loop. At varying time intervals of follow- up, no clinically statistically significant different outcomes were identified using stability testing via the KT1000 device and nor were differences found in graft failure. This study however, was not a prospective randomised study and has methodological flaws. In particular, there is a potential for bias in interpreting the assessment of the pivot shift and Lachman tests post-operatively as this was carried out by the operating surgeons who were not blinded to the type of surgery undertaken. Data was available for all 188 patients at the 6 month post-operative time frame- by which time graft healing should have occurred. However, only 58.5% of patients had data at 1 year follow-up and only 11.2% of patients achieved 2 year follow up. The graft diameter was statistically significantly larger in the adjustable loop cohort which can affect graft healing. Nevertheless, despite these limitations, this study outlined there was no detriment to using the adjustable loop system compared to the fixed loop in a clinical setting.