Erratum to: Evidence-based indications for hindfoot endoscopy

The author would like to correct the following errors in the online publication of the article: In the “Hindfoot periarticular area” section, under the sub-heading “Posterior ankle impingement”, the seventh and eighth paragraph should read as: The AOFAS score was the most frequently used clinical outcome score; where used, cumulative results showed average post-operative score of 90.6 points [1, 2, 11, 22, 24, 27, 32, 42, 50, 56, 64, 68] and pre- to post-operative increase by an average of 24.0 points [1, 2, 24, 27, 32, 42, 50, 56, 64]. Six studies reported results of isolated os trigonum excision in 99 ankles [2, 18, 22, 24, 33, 46]: the pre- to postoperative increase in AOFAS was available for 22 patients and reached 33.7 points [2, 24], while pre- to post-operative VAS decrease was available for 62 patients and was >6 points [18, 24, 33]. In the “Articular joint spaces” section, under the subheading “Subtalar joint articular space”, the first paragraph should read as follows: Osteoarthritis Level of evidence IV and V Degenerative changes of the subtalar joint are reported in the literature as indications for hindfoot endoscopy in prone position, eitherby means of talocalcaneal arthrodesis [3-5, 10, 29, 30, 38,39, 57] or arthroscopic osteophyte resection and debridement [39, 42]. Seven retrospective case series adequately documented the clinical results of 73 procedures of posterior arthroscopic subtalar arthrodesis (PASTA) [3, 4, 10, 29, 30, 38, 57]. Over these studies, post-traumatic or primary osteoarthritis were the preoperative indications for PASTA in more than 90 % of the cases. In five cases, subtalar arthropathy was related to a tarsal coalition [3, 4]. Five of the seven series evaluated post-operative clinical outcome with the AOFAS score: the cumulative results showed average post-operative score by 80.3 points and pre- to postoperative increase by an average of 40.4 points [3, 4, 29, 38, 57] The original article has been updated accordingly.