Objective: 1- Evaluate the results of ankle arthroscopy
2- Evaluate the surgical indication and technique of ankle arthroscopy. Patients and methods: retrospective research on 40 patients underwent ankle arthroscopy in Viet Duc University Hospital and Hanoi Medical University Hospital. Results: 70 percent male patients, average age is 41.9 + or - 18.5. 50 percent impingement, 40 percent OCD lesion and 10 percent old ankle fracture. Evaluate the results with Olerud Molander with increasing score at least 10 points, all patients satisfied with the results. Conclusion: ankle arthroscopy give good results.