Inui, Takahiro http://orcid.org/0000-0003-4733-5281
Watanabe, Yoshinobu
Kurata, Yoshiaki
Suzuki, Takashi
Matsui, Kentaro
Ishii, Keisuke
Kurozumi, Taketo
Kawano, Hirotaka
Article History
Received: 15 January 2020
Accepted: 15 July 2020
First Online: 23 July 2020
Compliance with ethical standards
:
: Each author certifies that he or she has no commercial associations (e.g. consultancies, stock ownership, equity interest, patent/licensing arrangements, etc.) that might pose a conflict of interest in connection with the submitted article. All ICMJE Conflict of Interest Forms for authors and Clinical Orthopaedics and Related Research editors and board members are on file with the publication and can be viewed on request.
: This retrospective investigation was performed at Sapporo Tokushukai Hospital. All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. The research protocol was approved by the institutional review board of Teikyo University and Sapporo Tokushukai Hospital.