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Fit of current glenoid component designs: an anatomic cadaver study
Anthony J Checroun1, Christopher Hawkins, Frederick J Kummer
1Shoulder Service, Hospital for Joint Diseases, New York, NY, USA.
Journal of Shoulder and Elbow Surgery
|December 7, 2002
Summary
Current glenoid implant designs show poor fit in many shoulder specimens. Improving glenoid component design and sizing is crucial for better fixation and longevity.
Area of Science:
- Orthopedic Surgery
- Biomedical Engineering
- Anatomy
Background:
- Glenoid component fixation is critical for the long-term success of total shoulder arthroplasty.
- The fit between the glenoid implant and the native glenoid bone influences osseous support and fixation stability.
Purpose of the Study:
- To evaluate the congruence of 6 commercially available glenoid implant systems with native glenoid anatomy.
- To determine the percentage of anatomical fit for each glenoid system based on predefined criteria.
Main Methods:
- Templating of 412 human scapula glenoids using 6 different glenoid implant systems.
- A fitting criterion was established: a maximum mismatch of less than 2 mm at 8 radial locations.
- Quantification of the percentage of glenoids successfully fitted by each system.
Main Results:
- The tested glenoid implant systems demonstrated variable fit, ranging from 0% to 48% congruence with the native glenoid periphery.
- No single system achieved a universally adequate fit across the diverse anatomical variations observed in the specimens.
Conclusions:
- Significant limitations exist in the current glenoid component designs regarding anatomical fit.
- Improvements in glenoid component design and sizing are necessary to enhance osseous support and potentially improve fixation longevity.