Abstract: Objective　To investigate the short-term clinical outcomes of arthroscopic single-tibial tunnel knotless suture anchor fixation in the treatment of tibial avulsion fracture of the anterior cruciate ligament (ACL). Methods　Twelve patients with ACL tibial avulsion fractures were included in the study, including 7 males and 5 females, with an average of (44.8±14.3) years (range 27-71 years). There were 8 cases caused by bruise, 2 cases of traffic accident and 2 cases of sports injuries. According to Meyers-McKeever classification criteria: 9 cases were type Ⅱ and 3 cases of type Ⅲ. There were 2 cases of meniscus injury and 2 cases of lateral collateral ligament injury. Under the arthroscopy, two Orthocord sutures were used to reduce the fracture, knotless suture anchor was screwed into the tibial tubercle through the single tibial tunnel to tighten the Orthocord sutures to reduce the ACL tibial fracture. X-rays and CT scan were used to evaluate fracture reduction and healing. Drawer test and Lachman test were used to evaluate knee joint stability. International Knee Documentation Committee (IKDC) score and Lysholm score were used to evaluate knee function after operation. Results　All patients successfully completed the operation without complications such as wound infection, joint infection or deep vein thrombosis. All patients were followed up 5-18 months (mean, 12.6 months±4.9 months). The anterior drawer test and Lachman test were negative for all patients after operation. At last follow-up, the X-ray film and CT scan showed that all cases achieved bone healing. The IKDC score improved from (39.17±3.56) points before surgery to (90.33±1.61) points after operation (P＜0.01). The Lysholm joint scores improved from (42.92±1.96) before surgery to (93.08±1.88) points after operation (P＜0.01). Conclusion　The method of Orthocord sutures passing through single tibial tunnel combined with knotless suture anchor under arthroscopy have the advantages of minimally invasive, reliable fixation and no metal implants.

Key words: arthroscope, anterior cruciate ligament, fractures, avulsion, single tibial tunnel, knotless suture anchor