Correction to: Treatment of acute Achilles tendon rupture - a multicentre, non-inferiority analysis
BMC Musculoskeletal Disorders volume 22, Article number: 193 (2021)
Correction to: BMC Musculoskelet Disord 21, 358 (2020)
Following publication of this article , the authors report the following Corrections to the main text:
The authors noticed that the reported number of patients that were treated surgically were too many (n = 363) and have corrected the numbers (n = 337). Patients from the cohort Nilsson-Helander et al.  were incorrectly labeled as surgically treated when they had received non-surgical treatment. In view of this database mix up, the statistical analysis was re-performed with the correct database and the results changed accordingly.
With updated guidelines on how to perform non-inferiority studies having been published in the New England Journal of Medicine , since the original analysis was published, the statistical method have accordingly been changed to using Fisher’s Non-parametric Permutation Test. The limb symmetry index for total work is inconclusive. The main conclusion, however, is unchanged that there is no significant difference between the surgery and non-surgery.
Westin O, Sjogren T, Svedman S, Horvath A, Hamrin Senorski E, Samuelsson K, Ackermann P. Treatment of acute Achilles tendon rupture - a multicentre, non-inferiority analysis. BMC Musculoskelet Disord. 2020;21(1):358.
Nilsson-Helander K, Sward L, Silbernagel KG, Thomee R, Eriksson BI, Karlsson J. A new surgical method to treat chronic ruptures and reruptures of the Achilles tendon. Knee Surg Sports Traumatol Arthrosc. 2008;16(6):614–20.
Mauri L, D'Agostino RB Sr. Challenges in the design and interpretation of noninferiority trials. N Engl J Med. 2017;377(14):1357–67.
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Westin, O., Sjögren, T., Svedman, S. et al. Correction to: Treatment of acute Achilles tendon rupture - a multicentre, non-inferiority analysis. BMC Musculoskelet Disord 22, 193 (2021). https://doi.org/10.1186/s12891-021-04045-7