Usefulness of Suture-Tape Augmentation Based on Intraoperative Ankle Stress Radiographs During Anatomical Ligament Repair for Chronic Lateral Ankle Instability.

Abstract

Background: During the modified Broström procedure for chronic ankle instability, surgeons often experience cases with insufficiently restored mechanical stability even after anatomical ligament repair. In these cases, longer postoperative immobilization and delayed rehabilitation can be required, and a risk for recurrence of instability may persist. This study aimed to evaluate the clinical usefulness of suture-tape augmentation based on intraoperative stress radiographs during anatomical ligament repair for chronic ankle instability.

Methods: Twenty-four patients who underwent additional suture-tape reinforcement because of residual mechanical instability on intraoperative stress radiographs were followed up ≥3 years. Clinical assessment was performed using the Foot and Ankle Outcome Score (FAOS) and Foot and Ankle Ability Measure (FAAM). Changes in mechanical stability were analyzed through periodic stress radiographs, and postural control ability was evaluated with the modified Romberg test.

Results: FAOS and FAAM scores improved significantly from preoperative mean 55.1 and 52.4 points to 92.3 and 90.2 points at final follow-up, respectively (P < .001). Talar tilt angle and anterior talar translation improved significantly from preoperative mean 15.8 degrees and 13.6 mm to 2.9 degrees and 4.2 mm, respectively (P < .001). Balance retention time improved significantly from preoperative mean 3.6 to 6.4 seconds (P < .001). Although 9 patients experienced sprain injury after surgery, no patient showed recurrence of mechanical and subjective instability, and 21 patients (87.5%) were able to return to preinjury level of sports activity.

Conclusion: Evaluation of residual mechanical instability through intraoperative stress view and additional suture-tape augmentation showed satisfactory clinical outcomes at midterm follow-up. Suture-tape augmentation based on intraoperative stress radiographs seems to be a useful surgical option for patients with insufficiently restored mechanical stability even after anatomical ligament repair. This combined procedure can provide a reliable mechanical stability that can be performed after recognition of residual instability during the index surgery.