Digital protractor as an intraoperative guide to cup anteversion in total hip arthroplasty.

"Declarations Ethics approval and consent to participateThis is a purely retrospective observational study, so the assignment of the medical intervention is not at the discretion of the investigators. This study has been granted an exemption from requiring ethics approval by the ethics committee of the Second People’s Hospital of Changzhou. Written informed consent was obtained from all participants included in the study. This study has been performed in accordance with the ethical standards laid down in the 1964 Declaration of Helsinki. Consent for publicationNot applicable. Competing interestsThe authors declare no competing interests. Competing interests The authors declare no competing interests."

"Funding This work was supported by Changzhou Health Talents Training Project (GW2023017)."