Can an adjustable-loop length suspensory fixation device reduce femoral tunnel enlargement in anterior cruciate ligament reconstruction? A prospective computer tomography study

Background: The aim of this study was to compare bone femoral tunnel enlargement in patients who underwent anterior cruciate ligament (ACL) transtibial reconstruction using an adjustable-loop length suspensory fixation device and a fixed-loop length suspensory fixation device. Methods: All patients treated for ACL reconstruction with an ipsilateral hamstring between March 2013 and March 2014 were evaluated. Subjects were assigned to Group A (TightRope™ (TR) femoral fixation) or Group B (EndoButton® (EB) femoral fixation). All patients were evaluated with the Lachman test, pivot-shift test, 2000 International Knee Documentation Committee (IKDC) knee examination and KT1000 arthrometer. The subjective evaluation was performed using the 2000 IKDC Subjective Knee score, the Lysholm knee score, and the Tegner activity scale. CT examination was performed to evaluate femoral tunnel enlargement at four different levels. All patients were assessed at a 12 month follow-up visit. Power analysis was performed a priori in accordance with the femoral tunnel enlargement values from the CT scans. Differences with P-values of ≤0.05 were considered to be statistically significant. Results: The groups were homogenous at baseline with regard to age, gender, BMI, dominance and disease duration. At the final follow-up, no statistically significant differences (P N 0.05) were found according to subjective and objective clinical outcome measures. According to the femoral tunnel enlargement, no statistically significant difference was found between the two groups (P N 0.05). Conclusion: In transtibial ACL reconstruction, the use of a fixed or adjustable-loop length device products, on the femoral side, led to similar clinical and radiological results