Endoscopic Excision of Symptomatic Os Trigonum in Professional Dancers

Abstract: Introduction: This study presents clinical results of excision of a symptomatic os trigonum with endoscopic procedure in professional ballet dancers. The hypothesis was that posterior endoscopic excisions of the os trigonum would be safe and effective in treating PAIS related to the os trigonum. Methods: Twelve professional dancers underwent excision of a symptomatic os trigonum for PAIS by posterior endoscopic technique, after failure of a conservative treatment. The patients were evaluated pre- and post- operatively according to the American Orthopedic Foot and Ankle Society (AOFAS) hindfoot score, the Tegner score and the Visual Analogic Scale (VAS). Surgical time, timing of return to sports (RTS), patient satisfaction and any complications related to the procedure were recorded. Results: The average duration of post-operative follow-up was 38.9±20.6 months (range 12-72). The mean value of the Tegner scale increased from 4.3±0.8 pre-operatively (range 3-5) to 9±0.2 at follow-up (P<0.05). The mean value of the AOFAS score increased from 67.8±6.0 (range 58-76), to 96±5.1 at follow-up (range 87-100) with seven patients out of 12 (58.3%) reporting the maximum score of 100 points (P<0.05). RTS was 8.7±0.7 weeks (range 8-10). No major complications were recorded. Conclusion: This study demonstrate that the endoscopic excision of symptomatic os trigonum with a 2-portal technique, after failure of a conservative treatment, is characterized by excellent results with low morbidity