TY - JOUR
T1 - Radial head prosthesis micromotion characteristics
T2 - Partial versus fully grit-blasted stems
AU - Chanlalit, Cholawish
AU - Fitzsimmons, James S.
AU - Moon, Jun Gyu
AU - Berglund, Lawrence J.
AU - An, Kai Nan
AU - O'Driscoll, Shawn W.
N1 - Funding Information:
Funding/IRB: This study was not supported by any outside funding or grants. The Mayo Clinic IRB that convened on September 17, 2007 approved the project, entitled “Evaluation of the radiocapitellar stability from concavity compression in relation to different types of radial head prostheses” (IRB protocol number 07-005111).
PY - 2011/1
Y1 - 2011/1
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
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U2 - 10.1016/j.jse.2010.05.030
DO - 10.1016/j.jse.2010.05.030
M3 - Article
C2 - 20932781
AN - SCOPUS:78649821783
SN - 1058-2746
VL - 20
SP - 27
EP - 32
JO - Journal of Shoulder and Elbow Surgery
JF - Journal of Shoulder and Elbow Surgery
IS - 1
ER -