Pure ligamentous ankle dislocation: A case report.

INTRODUCTION AND

IMPORTANCE

Pure ankle dislocation is a rare injury, and this injury is an orthopedic emergency requiring immediate reduction. In more common circumstances, this injury is usually associated with malleolar fractures. The standardized treatment protocol is still deficient.

CASE PRESENTATION: We report a case of a 33-year-old woman who presented with an open ankle dislocation without concomitant malleolar fractures. Early extensive wound debridement, immediate reduction, and immobilization of the ankle joint using an external fixator were performed during the first surgery. During the second surgery, which was performed 3 weeks later, the medial and lateral ankle ligaments were repaired, and a suture tape internal brace was added. A good functional outcome with the American Foot and Ankle Society score of 87 was achieved at 1-year follow-up.

DISCUSSION: In an open dislocation with massive ligamentous injury, staged surgery could be performed to prevent deep infection, with extensive debridement and immobilization using an external fixator in the first stage and ligament repair in the second stage. An internal brace using a suture tape is an option for ligament repair if the remnant is not sufficient to be repaired, as in this case. Early range of motion exercises should be initiated after second-stage surgery to prevent stiffness.

CONCLUSION

Staged surgery using an external fixator and ligament repair using a suture tape and internal brace augmentation can be an effective option for a pure ligamentous ankle dislocation with an open wound and a poor remnant of ankle ligaments.