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Reverse Total Shoulder Arthroplasty
Published on: July 5, 2011
Reverse total shoulder arthroplasty: radiological and clinical result using an eccentric glenosphere
Carlo Felice De Biase1, Marco Delcogliano, Mario Borroni
1Responsabile Unità Operativa Semplice di Chirurgia della Spalla, Divisione di Ortopedia e Traumatologia, Azienda Ospedaliero Universitaria di Parma, Via Gramsci 14, Parma, Italy. cfdebiase@me.com
Musculoskeletal Surgery
|April 25, 2012
Summary
This study found that an eccentric glenosphere in reverse shoulder arthroplasty significantly improved patient outcomes and prevented inferior scapular notching. The design lowers the center of rotation, reducing complication risks.
Area of Science:
- Orthopedic Surgery
- Biomedical Engineering
- Radiology
Background:
- Inferior scapular notching is a complication in reverse shoulder arthroplasty with concentric glenoid designs.
- Eccentric glenospheres aim to reduce this complication by lowering the center of rotation.
Purpose of the Study:
- To evaluate clinical and radiographic outcomes of reverse shoulder arthroplasty using an eccentric glenosphere.
- To determine if this design prevents inferior scapular notching.
Main Methods:
- Retrospective study of 25 patients undergoing reverse shoulder arthroplasty with an eccentric 36-mm glenoid component (2006-2010).
- Clinical evaluation (Constant Score, VAS, range of motion) and radiographic assessment (PSNA, PGRD, glenosphere-scapula distance) preoperatively and postoperatively.
- Preoperative MRI/CT and postoperative X-rays were used to assess for notching and measure angles/distances.
Main Results:
- Significant improvements in Constant Score, VAS score, and range of motion at an average follow-up of 27.5 months.
- Average prosthesis-scapular neck angle (PSNA) was 92° + 29°, average peg-glenoid rim distance (PGRD) was 21.2 mm + 9 mm.
- No instances of inferior scapular notching or implant-related complications were observed.
Conclusions:
- The eccentric glenosphere design effectively lowers the center of rotation in reverse shoulder arthroplasty.
- This design appears to prevent inferior scapular notching and offers favorable clinical outcomes.
