Abstract
Background: Compared to fully textured prosthetic stems, partial texturing lessens bone loss due to stress shielding and makes removal easier. However, initial press-fit stability is necessary for bone ingrowth. Hypothesis: There is no significant difference in the initial stability of radial head prostheses that are partially grit-blasted compared to those that are fully grit-blasted. Materials and methods: Cadaveric radii were implanted with partial or fully grit-blasted radial head prostheses. Micromotion of the stem at the isthmus of the canal and stem tip were measured under circumstances simulating eccentric loads. Results: Micromotion was not significantly different in the fully grit-blasted stems (isthmus, 11 ± 1 μm; tip, 21 ± 2 μm) and partially grit-blasted stems (isthmus, 13 ± 2 μm; tip, 25 ± 2 μm) (P = 0.4). The direction of loading had no effect on micromotion characteristics in either the fully or partially grit-blasted stems (P = .07). Discussion: Micromotion is comparable in partially and fully grit-blasted radial head prosthetic stems. For both stem surfaces, micromotion was well within the range that is conducive for bone ingrowth. A partially textured stem might have less bone loss due to stress shielding, making it easier to remove without destroying bone. Conclusion: The initial stability of a radial head stem that is partially grit-blasted only at the proximal end is comparable to that of a radial head stem that is grit-blasted along its entire length.
Original language | English |
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Pages (from-to) | 27-32 |
Number of pages | 6 |
Journal | Journal of Shoulder and Elbow Surgery |
Volume | 20 |
Issue number | 1 |
DOIs | |
Publication status | Published - 2011 Jan |
Externally published | Yes |
Keywords
- Basic Science Study
- Grit-blasted stem
- Initial stability, stem surface
- Radial head prosthesis
- Stress shielding
ASJC Scopus subject areas
- Surgery
- Orthopedics and Sports Medicine