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Bony Increased-offset Reversed Shoulder Arthroplasty: Minimizing Scapular Impingement While Maximizing Glenoid Fixation

  • Symposium: Reverse Total Shoulder Arthroplasty
  • Published:
Clinical Orthopaedics and Related Research®

Abstract

Background

Scapular notching, prosthetic instability, limited shoulder rotation and loss of shoulder contour are associated with conventional medialized design reverse shoulder arthroplasty. Prosthetic (ie, metallic) lateralization increases torque at the baseplate-glenoid interface potentially leading to failure.

Questions/purposes

We asked whether bony lateralization of reverse shoulder arthroplasty would avoid the problems caused by humeral medialization without increasing torque or shear force applied to the glenoid component.

Patients and Methods

We prospectively followed 42 patients with rotator cuff deficiency treated with bony increased-offset reverse shoulder arthroplasty. A cylinder of autologous cancellous bone graft, harvested from the humeral head, was placed between the reamed glenoid surface and baseplate. Graft and baseplate fixation was achieved using a lengthened central peg (25 mm) and four screws. Patients underwent clinical, radiographic, and CT assessment at a minimum of 2 years after surgery.

Results

The humeral graft incorporated completely in 98% of cases (41 of 42) and partially in one. At a mean of 28 months postoperatively, no graft resorption, glenoid loosening, or postoperative instability was observed. Inferior scapular notching occurred in 19% (eight of 42). The absolute Constant-Murley score improved from 31 to 67. Thirty-six patients (86%) were able to internally rotate sufficiently to reach their back over the sacrum.

Conclusions

Grafting of the glenoid surface during reverse shoulder arthroplasty effectively creates a long-necked scapula, providing the benefits of lateralization. Bony increased-offset reverse shoulder arthroplasty is associated with low rates of inferior scapular notching, improved shoulder rotation, no prosthetic instability and improved shoulder contour. In contrast to metallic lateralization, bony lateralization has the advantage of maintaining the prosthetic center of rotation at the prosthesis-bone interface, thus minimizing torque on the glenoid component.

Level of Evidence

Level IV, therapeutic study. See Guidelines for Authors for a complete description of levels of evidence.

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Authors and Affiliations

  1. Department of Orthopaedic Surgery & Sports Traumatology, Hôpital de L’Archet–University of Nice-Sophia-Antipolis, 151, Route de St Antoine de Ginestière, 06202, Nice, France

    Pascal Boileau MD, Grégory Moineau MD & Kieran O’Shea FRCSI

  2. Clinique Orthodoc, 5 rue Gerhardt, 34000, Montpellier, France

    Yannick Roussanne MD

Authors
  1. Pascal Boileau MD
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  2. Grégory Moineau MD
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  3. Yannick Roussanne MD
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  4. Kieran O’Shea FRCSI
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Corresponding author

Correspondence to Pascal Boileau MD.

Additional information

One author (PB) declares a commercial association (Tornier) that might pose a conflict of interest in connection with the submitted article.

Each author certifies that his or her institution approved or waived approval for the human protocol for this investigation and that all investigations were conducted in conformity with ethical principles of research.

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Boileau, P., Moineau, G., Roussanne, Y. et al. Bony Increased-offset Reversed Shoulder Arthroplasty: Minimizing Scapular Impingement While Maximizing Glenoid Fixation. Clin Orthop Relat Res 469, 2558–2567 (2011). https://doi.org/10.1007/s11999-011-1775-4

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  • DOI: https://doi.org/10.1007/s11999-011-1775-4

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