Background There is still controversy about the augmentation of the inferior extensor retinaculum after arthroscopic anterior talofibular ligament repair. The aim of this study was to evaluate the arthro-Broström procedure with endoscopic retinaculum augmentation using all-inside lasso-loop stitch techniques for chronic lateral ankle instability. Methods Thirty-four cases with type-2 or type-3 chronic anterior talofibular ligament lesions who underwent the arthro-Broström procedure with endoscopic retinaculum augmentation using all-inside lasso-loop stitch techniques were assessed retrospectively. A total of 30 cases (30 ankles) were followed up for a mean of 26.67 ± 4.19 months (range, 24–36 months). Five cases were excluded due to insufficient medical records or loss of follow-up reports. The Cumberland Ankle Instability Tool scores, The Karlsson-Peterson scores and Visual Analogue Scale scores were evaluated before surgery and at the final follow-up time. Also, the results of stress fluoroscopic tests and complications were recorded. Results At the final follow-up, the average of the Cumberland Ankle Instability Tool scores, The Karlsson-Peterson scores and Visual Analogue Scale scores were 86.63 ± 6.69 (range, 77–100), 90.17 ± 4.64 (range, 85–100) and 0.53 ± 0.63 (range, 0–2), respectively. Moreover, the results of stress fluoroscopic tests were improved significantly after surgery. Mild keloid formation and/or knot irritation were observed in four cases. No wound infections, nerve injuries and recurrent instability were recorded. Also, no stiffness or arthritis of the subtalar joint was encountered. Conclusions The arthro-Broström procedure combined with endoscopic retinaculum augmentation using all-inside lasso-loop techniques is reliable and safe due to satisfactory clinical results and avoiding nerve injuries. Level of evidence: Level IV, retrospective case series.

Background: There is still controversy about the augmentation of the inferior extensor retinaculum (IER) after arthroscopic anterior talofibular ligament (ATFL) repair. The aim of this study was to evaluate the arthro-Broström procedure with endoscopic retinaculum augmentation using all-inside lasso-loop stitch techniques for chronic lateral ankle instability. Methods: Thirty-four cases with type-2 or type-3 chronic ATFL lesions who underwent the arthro-Broström procedure with endoscopic retinaculum augmentation using all-inside lasso-loop stitch techniques were assessed retrospectively. A total of 30 cases (30 ankles) were followed up for a mean of 26.67 ± 4.19 months (range, 24 - 36 months). Five cases were excluded due to insufficient medical records or loss of follow-up reports. The Cumberland Ankle Instability Tool (CAIT) scores, The Karlsson-Peterson scores and Visual Analogue Scale (VAS) scores were evaluated before surgery and at the final follow-up time. Also, the results of stress fluoroscopic tests and complications were recorded. Results: At the final follow-up, the average of the Cumberland Ankle Instability Tool (CAIT) scores, The Karlsson-Peterson scores and VAS scores were 86.63 ± 6.69 (range, 77 - 100), 90.17 ± 4.64 (range, 85 - 100) and 0.53 ± 0.63 (range, 0 - 2), respectively. Moreover, the results of stress fluoroscopic tests were improved significantly after surgery. Mild keloid formation and/or knot irritation were observed in four cases. No wound infections, nerve injuries and recurrent instability were recorded. Also, no stiffness or arthritis of the subtalar joint was encountered. Conclusions: The arthro-Broström procedure combined with endoscopic retinaculum augmentation using all-inside lasso-loop techniques is reliable and safe due to satisfactory clinical results and avoiding nerve injuries.