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The use of an eccentric glenosphere compared with a concentric glenosphere in reverse total shoulder arthroplasty: two-year minimum follow-up results

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Abstract

Purpose

The current models of reverse shoulder arthroplasty (RSA) expose the procedure to the risk of scapular notching, possibly leading to loosening of the glenoid. We compared the clinical and radiographic results obtained with a concentric or eccentric glenosphere to assess whether the eccentric design might give better clinical results and avoid or decrease the risk of scapular notching

Methods

Of our patients, 31 underwent RSA using a concentric glenosphere (group A), while 29 had an eccentric glenosphere (group B). Postoperatively, patients were followed-up at one to 12 months and annually thereafter, with the mean being 33 months in group A and 27.5 in group B. In both groups the minimum follow up (F-U) was 24 months. Preoperatively and at each F-U starting from six months, patients were assessed using the Constant score. On radiographs, prosthesis scapular neck angle (PSNA), distance between scapular neck and glenosphere (DBSNG) and peg-glenoid rim distance (PGRD) were calculated. The severity of notching was classified in four grades.

Results

In group A the mean Constant score increased by 30 points compared to the preoperative score and the active ROM increased considerably. At latest F-U, the mean PSNA, DBSNG and PGRD were, respectively, 87°, 3.4 mm and 19.8 mm. Glenoid notching was present in 42 % of cases. In group A, the mean Constant score increased by 34 points and the mean ROM was better than in group A. The average PSNA, PGRD and DBSNG were, respectively, 92°, 21.2 mm and 4.3 mm. Radiographs showed no inferior scapular notching.

Conclusions

The eccentric glenosphere yielded better clinical results than the concentric glenosphere and was associated with no scapular notching.

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Authors and Affiliations

  1. Orthopaedic Division, University Hospital of Parma, Parma, Italy

    Carlo Felice De Biase & Marco Delcogliano

  2. Orthopaedic Clinic, University Hospital of Parma, Parma, Italy

    Giovanni Ziveri & Francesca de Caro

  3. Hospital Umberto I, University La Sapienza, Roma, Rome, Italy

    Stefano Gumina

  4. Humanitas Clinical Institute, Milan, Italy

    Mario Borroni & Alessandro Castagna

  5. Israelite Hospital, Rome, Italy

    Roberto Postacchini

Authors
  1. Carlo Felice De Biase
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  2. Giovanni Ziveri
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  3. Marco Delcogliano
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  4. Francesca de Caro
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  5. Stefano Gumina
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  6. Mario Borroni
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  7. Alessandro Castagna
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  8. Roberto Postacchini
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Correspondence to Giovanni Ziveri.

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De Biase, C.F., Ziveri, G., Delcogliano, M. et al. The use of an eccentric glenosphere compared with a concentric glenosphere in reverse total shoulder arthroplasty: two-year minimum follow-up results. International Orthopaedics (SICOT) 37, 1949–1955 (2013). https://doi.org/10.1007/s00264-013-1947-9

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  • DOI: https://doi.org/10.1007/s00264-013-1947-9

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