Abstract:Objective To explore the clinical effect of modified internal fixation and fusion in the treatment of juvenile accessory navicular syndrome (ANS).Methods The data of 19 patients (24 feet) with ANS admitted to foot and ankle surgery of Xi′an Honghui hospital from March 2017 to May 2019 were analyzed retrospectively.All patients were treated with modified internal fixation and fusion.Before and at the last follow-up,the patients were measured in terms of talocal caneal angle(TCA),calcaneal pitch angle(CPA) and talar first metatarsal angle(Meary angle).The middle foot score of the American Orthopaedic Foot and Ankle Society (AOFAS) and pain visual analogue score (VAS) were used to evaluate foot function and pain improvement.Results Nineteen patients were followed up for 12-24 months (average 16.5 months).There was no statistically significant difference in TCA between the last follow-up and before operation( P>0.05).Compared with before operation,X-ray CPA (17.60°±2.67° vs 15.13°±2.34°),Meary angle(1.75°±- 0.87° vs -2.60°±-1.18°),the middle foot score of AOFAS (87.85±5.14 vs 57.50±3.85),and the VAS score(1.75±0.77 vs 6.00±0.51)were improved ( P<0.01).Conclusion For juvenile ANS patients,improved internal fixation and fusion can effectively improve the arch of foot,relieve symptoms,improve foot function and imaging performance.