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Table 4 Outcomes of AOFAS score

From: Arthroscopic ankle fusion only has a limited advantage over the open operation if osseous operation type is the same: a retrospective comparative study

 Between-group difference (all patients)Difference detailed into subgroup (osseous operation type: not same)Difference detailed into subgroup (osseous operation type: same)Internal difference of OAF group (osseous operation type: not same)
AAFOAFPAAFCOOPAAFSOOPCOOSOOP
Mean of AOFAS score
 Within 2 weeks before surgery36.2 ± 13.5 (n = 17)32.5 ± 11.8 (n = 26)0.34736.2 ± 13.5 (n = 17)30.7 ± 12.8 (n = 15)0.25336.2 ± 13.5 (n = 17)34.8 ± 10.5 (n = 11)0.78030.7 ± 12.8 (n = 15)34.8 ± 10.5 (n = 11)0.395
 Post-op 3 months63.1 ± 3.3 (n = 17)59.6 ± 4.7 (n = 26)0.01363.1 ± 3.3 (n = 17)57.9 ± 4.7 (n = 15)0.00163.1 ± 3.3 (n = 17)61.9 ± 3.9 (n = 11)0.41257.9 ± 4.7 (n = 15)61.9 ± 3.9 (n = 11)0.031
 Post-op 6 months70.5 ± 5.7 (n = 15)66.7 ± 5.1 (n = 25)0.03470.5 ± 5.7 (n = 15)64.9 ± 3.8 (n = 15)0.00470.5 ± 5.7 (n = 15)69.4 ± 5.7 (n = 10)0.63364.9 ± 3.8 (n = 15)69.4 ± 5.7 (n = 10)0.027
 Post-op 1 year76.2 ± 3.9 (n = 16)73.0 ± 7.1 (n = 23)0.16076.2 ± 3.9 (n = 16)72.1 ± 6.2 (n = 14)0.03776.2 ± 3.9 (n = 16)74.3 ± 8.1 (n = 9)0.43972.1 ± 6.2 (n = 14)74.3 ± 8.1 (n = 9)0.467
 Final (at least 1 year post-op)77.7 ± 3.8 (n = 17)75.8 ± 4.5 (n = 26)0.14877.7 ± 3.8 (n = 17)75.4 ± 3.7 (n = 15)0.09077.7 ± 3.8 (n = 17)76.3 ± 5.6 (n = 11)0.42375.4 ± 3.7 (n = 15)76.3 ± 5.6 (n = 11)0.632
  1. AAF arthroscopic ankle fusion group, OAF open ankle fusion group (demographic composition: OAF = COO + SOO), COO complex osseous operation, SOO simple osseous operation, Post-op postoperative, AOFAS score the American Orthopedic Foot and Ankle Society score. P P values: α = 0.05 (Independent-samples t test)