Abstract:Abstract: Objective To investigate the surgical method and clinical efficacy of the anatomic reconstruction of the anterior talofibular ligament (ATFL) with autologous peroneal long muscle tendon under ankle arthroscopy. Methods From December 2012 to January 2017, 32 patients with lateral ankle ligament injury were treated with autologous peroneal long muscle tendon under the ankle arthroscope. The American Foot and Ankle Surgery Society score (AOFAS), Tegner exercise level score and talus tilt angle change were used to evaluate the curative effect before and after operation, followed up to observe the occurrence of complications. Result All the 32 patients were followed up for 12 to 36 (26.00 ± 6.55) months. During the follow-up period, ankle activity was basically restored to normal in all of them, and ankle instability was not observed at the last follow-up. Ankle swelling and pain disappeared. Stress test of metatarsal varus (-) and drawer test (-). At the last follow-up, the AOFAS score was (92.00 ± 3.84) and the Tegner score was (6.03 ± 1.15), which was significantly higher than the preoperative improvement and the talus inclination angle (4.61 ± 1.09)°, and the difference was statistically significant (P < 0.05). Conclusion Anatomical reconstruction of ATFL with tendon of long peroneal muscle under ankle arthroscopy for the treatment of lateral instability of ankle joint. Ankle arthroscopy can detect ligament stump more accurately, locate ligament attachment points, and reconstruct ATFL in situ. The effect is ideal.