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Updated: Aug 11, 2026
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An Improved Mechanical Testing Method to Assess Bone-implant Anchorage
Published on: February 10, 2014
Radiologic, mechanical, and histologic evaluation of 2 glenoid prosthesis designs in a canine model
M A Wirth1, D L Korvick, C J Basamania
1Department of Orthopaedics, University of Texas Health Science Center, San Antonio 78229-3900, USA.
Journal of Shoulder and Elbow Surgery
|April 18, 2001
Summary
A novel uncemented pegged glenoid component demonstrated superior bone ingrowth and fixation strength compared to conventional keeled glenoids in canine shoulder arthroplasty. This new design offers improved implant stability and osseous integration for better long-term outcomes.
Area of Science:
- Orthopedic Surgery
- Biomaterials Science
- Veterinary Orthopedics
Background:
- Aseptic loosening of glenoid components is a significant complication in total shoulder arthroplasty, leading to implant failure.
- Current conventional keeled glenoid designs often exhibit radiolucent lines, indicating poor fixation and potential loosening.
- Improved glenoid fixation is crucial for enhancing the longevity and success of shoulder replacement surgeries.
Purpose of the Study:
- To compare the fixation efficacy of a new uncemented pegged glenoid design against conventional cemented keeled glenoids.
- To evaluate bone ingrowth, osseous integration, and mechanical fixation strength in a weight-bearing canine model.
- To determine the impact of glenoid implant design on fixation stability over time.
Main Methods:
- A comparative study using weight-bearing canine shoulders.
- Radiographic, histological, and mechanical testing were performed at 0, 3, and 6 months post-surgery.
- Evaluation of an uncemented pegged glenoid versus a conventional cemented keeled glenoid.
Main Results:
- The uncemented pegged glenoid achieved significant bone ingrowth around the flanges, confirmed radiographically and histologically.
- Mechanical testing showed a significant increase in fixation strength for the pegged glenoid between 0 and 3 months, maintained through 6 months.
- Conventional keeled glenoids displayed radiolucent lines and a significant decrease in fixation strength between 0 and 3 months, persisting through 6 months.
Conclusions:
- The cementless fluted peg stem design significantly enhances osseous integration and implant fixation compared to conventional cemented keel designs.
- Stem design modifications are effective in improving implant fixation and addressing aseptic loosening in shoulder arthroplasty.
- The uncemented pegged glenoid demonstrates superior biomechanical stability and bony integration in a weight-bearing model, suggesting potential clinical benefits.
