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Outcomes of reverse shoulder arthroplasty using a mini 25-mm glenoid baseplate

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Abstract

Purpose

As worldwide use of reverse shoulder arthroplasty (RSA) increases, a range of implant sizes may be required to match regional and ethnic variation in patients’ height and bone size. The purpose of this study was to report the outcomes of RSA using a mini 25-mm-diameter glenoid baseplate in smaller patients with rotator cuff arthropathy.

Methods

Between 2009 and 2012, 28 patients underwent RSA for cuff-tear arthropathy using a 25-mm circular glenoid baseplate (Aequlais Reversed, Tornier, Bloomington, MN, USA). Twenty-four patients were able to return for comprehensive follow-up. The mean height of the entire cohort was 158 ± 10 cm (5 ft. 2 in.). The indication to use a smaller baseplate was a combination of preoperative templating using computed tomography (CT) and intraoperative measurements of glenoid width.

Results

At a mean of 36 ± 8 months’ follow-up, there were no revisions or glenoid-sided failures. The mean American Shoulder and Elbow Surgeons (ASES) score was 70 ± 10, the Simple Shoulder Test (SST) was 10 ± 2, the Constant was 60 ± 10 and the Disabilities of the Arm, Shoulder and Hand (DASH) was 18 ± 15. Mean active forward elevation was 140 ± 15°, active external rotation was 21 ± 15° and active internal rotation was to the sacroiliac joint. Mean shoulder strength in flexion was 5.2 ± 1.7 kg, in external rotation was 2.9 ± 1.4 kg and in internal rotation was 4.3 ± 1.2 kg. Radiographs demonstrated no evidence of glenoid loosening. There was, however, a 62 % rate of scapular notching.

Conclusions

Short-term outcomes of mini 25-mm baseplate RSA in proportionally smaller patients are good and demonstrate implant safety and effectiveness. Scapular notching rates are worrisome, and additional follow-up is necessary to determine if notching is progressive and becomes symptomatic.

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Compliance with Ethical Standards

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Competing interest

Kenneth Faber is a consultant for Exactech. Additionally, he has received research support from Tornier Inc for research related to the subject of this article. No company had any input in to the study design, protocol, testing, data analysis or manuscript preparation.

George Athwal is a consultant for Tornier Inc and DePuy Synthes. He is not a designer of the implant examined in this study and he does not receive royalties. Additionally, he has received research support from Tornier Inc and DePuy Synthes for research related to the subject of this article. No company had any input in to the study design, protocol, testing, data analysis or manuscript preparation.

Ethical approval

The Western University Health Science Research Ethics Board approved this study (Study number105965).

Informed consent

Written informed consent was obtained from the patient(s) for the publication of this report and anyaccompanying images.

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Authors and Affiliations

  1. Roth|McFarlane Hand and Upper Limb Center, St Joseph’s Health Care, University of Western Ontario, London, ON, Canada

    George S. Athwal & Kenneth J. Faber

  2. Roth|McFarlane Hand and Upper Limb Centre, St. Joseph’s Health Care, 268 Grosvenor St, London, ON, N6A 4L6, Canada

    George S. Athwal

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  1. George S. Athwal
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  2. Kenneth J. Faber
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Correspondence to George S. Athwal.

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Athwal, G.S., Faber, K.J. Outcomes of reverse shoulder arthroplasty using a mini 25-mm glenoid baseplate. International Orthopaedics (SICOT) 40, 109–113 (2016). https://doi.org/10.1007/s00264-015-2945-x

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  • DOI: https://doi.org/10.1007/s00264-015-2945-x

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