Abstract: [Abstract]Objective To evaluate the surgical outcome of Brostrom procedure assisted with arthroscopic. Method This is a retrospective study involving 32 patients who underwent Brostrom procedure assisted with arthroscopic for lateral ankle instability at Tongji Hospital, 21 patient is completed follow-up from December 2010 to December 2014. The patients consisted of 16 males and 5 females with an average age of 23.5 years. The American Orthopaedic Foot and Ankle Society (AOFAS) Ankle-Hindfoot Score was used to assess the pain and functional status in preoperative examination and postoperative follow-up at 3 months, 6 months，12 month and 18 months. Results Via Intra-operative ankle arthroscopic we found 19 patients associated with intra-articular lessions, presenting as synovitis in 12 cases，osteochondral lesion in 6 cases, osteophyte formation in 4 cases, soft tissue impingement in 3 cases, and syndesmosis widening in 1 case. The preoperative AOFAS score was 51.31±17.19. The AOFAS score for postoperative follow-up at 3 months was 77.40±9.99，6 months was 91.55±6.91, 12 months was 96.46±5.30, and 18 months was 97.15±3.08. Conclusion The Brostrom procedure assisted with ankle arthroscopic treatment for lateral ankle instability is a safe and effective method offering satisfying surgical outcome.

Key words: Ankle joint, Lateral instability, Arthroscopic surgery, Ligament