Abstract:[Objective] To explore the effect of clavicular and coracoid bone tunnel enlargement and reduction loss on clinical out- comes after coracoclavicular ligament anatomical reconstruction. [Methods] A retrospective study was conducted on 30 patients who re- ceived coracoclavicular ligament anatomical reconstruction for Rockwood type III-V acromioclavicular dislocation in our department from November 2012 to December 2021. Clinical outcomes were evaluated by ASES, Constant-Murley and ULCA scores, whereas the coraco- clavicaular distance (CCD) , maximum diameter of coracoid bone tunnel and clavicular bone tunnel were measured radiographically. Pear- son or Spearman correlation analyses was used to search the correlation between clinical scores and changes of imaging measurement pa- rameters. [Results] All the 30 patients were successfully operated on, and followed up for (13.5±4.5) months on an average. At latest followup, the ASES, Constant-Murley and ULCA scores significantly increased compared with those preoperatively (P<0.05) . However, the CCD and maximum diameter of coracoid and clavicular bone tunnel significantly increased at the latest follow-up compared with those within 3 days after operation (P<0.05) . At latest follow-up, the ASES, Constant-Murley and ULCA scores proved not significantly correlated with the increments of CCD and the maximum diameter of coracoid and clavicular bone tunnels (P>0.05) . Moreover, the increment of CCD was not correlated with those of the maximum diameter of coracoid and clavicle bone tunnels (P>0.05) . The increment of maximum diameter of coracoid bone tunnel was positively correlated with that of the maximum diameter of clavicle bone tunnel (P<0.05) . [Conclusion] The clavi- cle and coracoid bone tunnels does be enlarged in some extent after coracoclavicular ligament anatomical reconstruction for Rockwood type III-V acromioclavicular dislocation. However, the bone tunnel enlargement is not proved related to reduction loss, and has no effect on the clinical outcome.