Optimal baseplate position in reverse shoulder arthroplasty in small-stature Japanese women : a cadaveric study

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  • Fukuta Shoji
    Department of Orthopaedic Surgery, National Hospital Organization Kochi National Hospital, Kochi, Japan Department of Orthopedics, Institute of Biomedical Sciences, Tokushima University Graduate School, Tokushima, Japan
  • Wada Keizo
    Department of Orthopedics, Institute of Biomedical Sciences, Tokushima University Graduate School, Tokushima, Japan
  • Higashino Kosaku
    Department of Orthopedics, Institute of Biomedical Sciences, Tokushima University Graduate School, Tokushima, Japan Department of Orthopaedic Surgery, National Hospital Organization Shikoku Medical Center for Children and Adults, Kagawa, Japan
  • Sairyo Koichi
    Department of Orthopedics, Institute of Biomedical Sciences, Tokushima University Graduate School, Tokushima, Japan
  • Tsuruo Yoshihiro
    Department of Anatomy and Cell Biology, Tokushima University Faculty of Medicine, Tokushima, Japan

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<p>The purpose of this study was to determine the optimal position of the baseplate on the small glenoid of female Japanese. Two sets of 3D scapular models were made according to the CT data of 7 female cadavers. We set two scenarios of the baseplate placement : A and B. In scenario A, the baseplate was placed on the glenoid face centrally in the anteroposterior direction. In scenario B, the baseplate was implanted at the point where the baseplate post was contained within the glenoid vault. Whether or not the baseplate post perforated the scapular neck was recorded. In scenario A, the central post penetrated the scapular neck posteriorly in 5 scapulae. In scenario B, the average distances from the guide pin position to the anterior glenoid rim was 9.7 ± 1.7 mm and the optimal position of the guide pin was 1.9 ± 1.7 mm anterior from the glenoid center. The central post was contained within the scapula without breakage of the cortex. This study demonstrated that shifting the center of the baseplate slightly anterior to the anatomic center is necessary to avoid perforation of the scapular neck in small female Japanese. J. Med. Invest. 68 : 175-180, February, 2021</p>

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