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 |
|---|---|
| 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 1 |
| Externally published | Yes |
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Keywords
- Basic Science Study
- Grit-blasted stem
- Initial stability, stem surface
- Radial head prosthesis
- Stress shielding
ASJC Scopus subject areas
- Orthopedics and Sports Medicine
- Surgery
Cite this
Radial head prosthesis micromotion characteristics : Partial versus fully grit-blasted stems. / Chanlalit, Cholawish; Fitzsimmons, James S.; Moon, Jungyu; Berglund, Lawrence J.; An, Kai Nan; O'Driscoll, Shawn W.
In: Journal of Shoulder and Elbow Surgery, Vol. 20, No. 1, 01.01.2011, p. 27-32.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Radial head prosthesis micromotion characteristics
T2 - Partial versus fully grit-blasted stems
AU - Chanlalit, Cholawish
AU - Fitzsimmons, James S.
AU - Moon, Jungyu
AU - Berglund, Lawrence J.
AU - An, Kai Nan
AU - O'Driscoll, Shawn W.
PY - 2011/1/1
Y1 - 2011/1/1
N2 - 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.
AB - 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.
KW - Basic Science Study
KW - Grit-blasted stem
KW - Initial stability, stem surface
KW - Radial head prosthesis
KW - Stress shielding
UR - http://www.scopus.com/inward/record.url?scp=78649821783&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=78649821783&partnerID=8YFLogxK
U2 - 10.1016/j.jse.2010.05.030
DO - 10.1016/j.jse.2010.05.030
M3 - Article
VL - 20
SP - 27
EP - 32
JO - Journal of Shoulder and Elbow Surgery
JF - Journal of Shoulder and Elbow Surgery
SN - 1058-2746
IS - 1
ER -