Background. Among coracoclavicular (CC) fixation techniques, the use of flip button device was demonstrated to have successful\noutcomes with the advantage of being able to accommodate an arthroscopic procedure. Purpose. This study was conducted to\ninvestigate the factors associated with loss of fixation after arthroscopically assisted CC fixation using a single flip button device\nfor acromioclavicular (AC) joint dislocations. Materials and Methods. We enrolled a total of 47 patients (35 men and 12 women).\nPlain radiography was performed at a mean of 24 months postoperatively to evaluate the final radiological outcome. The primary\noutcome measure was a long-term reduction of the AC joint for at least 24 months. Results. We found that 29 patients had a\nhigh quality reduction (61.7%) and 18 patients had a low quality reduction (38.3%) in initial postoperative CT findings. Our study\nshowed that the duration (5 days) from injury to treatment and the quality of initial postoperative reduction were significantly\nassociated with the maintenance of reduction at final follow-up. Conclusion. Our study showed that maintaining stable reduction\nafter arthroscopically assisted CC fixation using a single flip button device technique is difficult especially in patients who received\ndelayed treatment or whose initial reduction quality was poor.
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