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Clin Should Elbow. 2019 Mar;22(1):24-28. English. Original Article. https://doi.org/10.5397/cise.2019.22.1.24
Oh JH , Lee S , Rhee SM , Jeong HJ , Yoo JC .
Department of Orthopedic Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea.
Department of Orthopedic Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea. shoulderyoo@gmail.com
Department of Orthopedic Surgery, Bundang Jesaeng Hospital, Seongnam, Korea.
Abstract

Background

Glenoid baseplate location is important to good clinical outcomes of reverse total shoulder arthroplasty (RTSA). The glenoid vault is the determining factor for glenoid baseplate location, but, to date, there are no reports on the effect of central cage location within the glenoid vault on RTSA outcomes when using the Exactech® Equinoxe® Reverse System. The purpose of this study was to determine the appropriate cage location in relation to the glenoid vault and monitor for vault and/or cortex penetration by the cage.

Methods

Data were retrospectively collected from the Samsung Medical Center (SMC) and Seoul National University Bundang Hospital (SNUBH). Patients who underwent RTSA between November 2016 and February 2018 were enrolled. Glenoid vault depth, central cage location within the vault were examined. Inferior glenoid rim-center distance, inferior glenoid rim-cage distance, and center-cage center distances were collected.

Results

Twenty-two patients were enrolled. Three SNUBH patients had inappropriate central cage fixation (33.3%) versus 4 SMC patients (30.8%). All cage exposures were superior and posterior to the glenoid vault. Mean center-cage distance was 5.0 mm in the SNUBH group and 5.21 mm in the SMC group. Center-prosthesis distance was significantly longer in the inappropriate fixation group than in the appropriate fixation group (p<0.024).

Conclusions

To ensure appropriate glenoid baseplate fixation within the glenoid vault, especially in a small glenoid, the surgeon should place the cage lower than usually targeted, and it should overhang the inferior glenoid rim.

Copyright © 2019. Korean Association of Medical Journal Editors.