Correction to: BMC Musculoskelet Disord 22, 816 (2021)

https://doi.org/10.1186/s12891-021-04695-7

Following the publication of the original article [1] the authors noticed that the note for equal contributors “†Zhongzheng Wang and Yanwei Wang contributed equally to this work.” did not appear in the proof.

The original article [1] has been updated.