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Reverse Total Shoulder Arthroplasty
Published on: July 5, 2011
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Optimal insertion site of glenoid baseplate in reverse total shoulder arthroplasty: anatomical simulation using three
Hyeon Jang Jeong1, Myeong Gon Jeong1, Sang Woo Kim1
1Department of Orthopaedic Surgery, Seoul National University College of Medicine, Seoul National University Bundang Hospital, 82, Gumi-Ro 173 Beon-Gil, Bundang-Gu, Seongnam-Si, Gyeonggi-Do, Republic of Korea.
International Orthopaedics
|October 9, 2021
Summary
The optimal glenoid baseplate insertion site is 2mm inferior and posterior to the conventional site. This finding improves bone stock for reverse total shoulder arthroplasty, enhancing implant stability.
Area of Science:
- Orthopedic surgery
- Biomedical engineering
- Radiology
Background:
- The conventional insertion site (CIS) for glenoid baseplates lacks strong theoretical support regarding optimal bone stock.
- Accurate baseplate placement is crucial for stability in reverse total shoulder arthroplasty.
Purpose of the Study:
- To identify the optimal insertion site for the glenoid baseplate by evaluating glenoid bone stock using 3D volumetric measurements.
- To provide anatomical data for precise baseplate positioning in shoulder arthroplasty.
Main Methods:
- Pre-operative CT scans of 30 patients undergoing reverse total shoulder arthroplasty were analyzed.
- 3D image processing software reconstructed CT data to measure glenoid bone stock.
- Simulated central pegs were inserted from 49 points around the CIS to calculate overlapped bone volume.
Main Results:
- The mean overlapped bone volume at the CIS was 623.0 ± 185.8 ml.
- The optimal insertion site, maximizing bone purchase, was found 2 mm inferior and posterior to the CIS.
- This optimal site yielded a mean overlapped volume of 765.3 ± 157.5 ml.
Conclusions:
- The ideal glenoid baseplate insertion point is slightly inferior and posterior to the conventional site.
- This anatomical information serves as a valuable reference for surgeons selecting implant positioning.
- Optimizing baseplate placement enhances bony purchase and potentially improves surgical outcomes.
