Abstract
No previous studies comparing the clinical wear rates of the two different kinds of cross-linked ultra-high-molecular-weight polyethylene (XLPE), annealed and remelted, are available. We compared the creep and steady wear rates of 36 matched pairs (72 hips in total) adjusting for baseline characteristics with propensity score matching techniques. Zirconia femoral heads with 26-mm diameter were used in all cases. The femoral-head cup penetration was measured digitally on radiographs. Significantly greater creep ( p=0.006) was detected in the remelted (0.234 mm) than annealed (0.159 mm) XLPE. However, no significant difference ( p=0.19) was found between the steady wear rates (0.003 and 0.008 mm/year, respectively) of the annealed and remelted XLPE. Multiple regression analyses showed that remelted XLPE is significant independent variable ( p<0.001) that is positively associated with creep. However, the patient age and body weight, cup size, the liner thickness, cup inclination, follow-up periods, and postoperative Merle d'Aubigné hip score had no significant effects ( p>0.05) on the steady wear rates. No patients exhibited above the osteolysis threshold of 0.1 mm/year, progressive radiolucencies, osteolysis, or polyethylene fracture. This[U+3000]propensity-matched cohort study document no significant difference in wear resistant performances of annealed and remelted XLPE over an average period of 10 years.
| Original language | English |
|---|---|
| Pages (from-to) | 99-107 |
| Number of pages | 9 |
| Journal | Journal of the Mechanical Behavior of Biomedical Materials |
| Volume | 59 |
| DOIs | |
| Publication status | Published - Jun 1 2016 |
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All Science Journal Classification (ASJC) codes
- Biomaterials
- Biomedical Engineering
- Mechanics of Materials
Cite this
Comparison of 10-year clinical wear of annealed and remelted highly cross-linked polyethylene : A propensity-matched cohort study. / Hamai, Satoshi; Nakashima, Yasuharu; Mashima, Naohiko; Yamamoto, Takuaki; Kamada, Tomomi; Motomura, Goro; Imai, Hiroshi; Fukushi, Jun ichi; Miura, Hiromasa; Iwamoto, Yukihide.
In: Journal of the Mechanical Behavior of Biomedical Materials, Vol. 59, 01.06.2016, p. 99-107.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Comparison of 10-year clinical wear of annealed and remelted highly cross-linked polyethylene
T2 - A propensity-matched cohort study
AU - Hamai, Satoshi
AU - Nakashima, Yasuharu
AU - Mashima, Naohiko
AU - Yamamoto, Takuaki
AU - Kamada, Tomomi
AU - Motomura, Goro
AU - Imai, Hiroshi
AU - Fukushi, Jun ichi
AU - Miura, Hiromasa
AU - Iwamoto, Yukihide
PY - 2016/6/1
Y1 - 2016/6/1
N2 - No previous studies comparing the clinical wear rates of the two different kinds of cross-linked ultra-high-molecular-weight polyethylene (XLPE), annealed and remelted, are available. We compared the creep and steady wear rates of 36 matched pairs (72 hips in total) adjusting for baseline characteristics with propensity score matching techniques. Zirconia femoral heads with 26-mm diameter were used in all cases. The femoral-head cup penetration was measured digitally on radiographs. Significantly greater creep ( p=0.006) was detected in the remelted (0.234 mm) than annealed (0.159 mm) XLPE. However, no significant difference ( p=0.19) was found between the steady wear rates (0.003 and 0.008 mm/year, respectively) of the annealed and remelted XLPE. Multiple regression analyses showed that remelted XLPE is significant independent variable ( p<0.001) that is positively associated with creep. However, the patient age and body weight, cup size, the liner thickness, cup inclination, follow-up periods, and postoperative Merle d'Aubigné hip score had no significant effects ( p>0.05) on the steady wear rates. No patients exhibited above the osteolysis threshold of 0.1 mm/year, progressive radiolucencies, osteolysis, or polyethylene fracture. This[U+3000]propensity-matched cohort study document no significant difference in wear resistant performances of annealed and remelted XLPE over an average period of 10 years.
AB - No previous studies comparing the clinical wear rates of the two different kinds of cross-linked ultra-high-molecular-weight polyethylene (XLPE), annealed and remelted, are available. We compared the creep and steady wear rates of 36 matched pairs (72 hips in total) adjusting for baseline characteristics with propensity score matching techniques. Zirconia femoral heads with 26-mm diameter were used in all cases. The femoral-head cup penetration was measured digitally on radiographs. Significantly greater creep ( p=0.006) was detected in the remelted (0.234 mm) than annealed (0.159 mm) XLPE. However, no significant difference ( p=0.19) was found between the steady wear rates (0.003 and 0.008 mm/year, respectively) of the annealed and remelted XLPE. Multiple regression analyses showed that remelted XLPE is significant independent variable ( p<0.001) that is positively associated with creep. However, the patient age and body weight, cup size, the liner thickness, cup inclination, follow-up periods, and postoperative Merle d'Aubigné hip score had no significant effects ( p>0.05) on the steady wear rates. No patients exhibited above the osteolysis threshold of 0.1 mm/year, progressive radiolucencies, osteolysis, or polyethylene fracture. This[U+3000]propensity-matched cohort study document no significant difference in wear resistant performances of annealed and remelted XLPE over an average period of 10 years.
UR - http://www.scopus.com/inward/record.url?scp=84952845581&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84952845581&partnerID=8YFLogxK
U2 - 10.1016/j.jmbbm.2015.12.022
DO - 10.1016/j.jmbbm.2015.12.022
M3 - Article
C2 - 26751705
AN - SCOPUS:84952845581
VL - 59
SP - 99
EP - 107
JO - Journal of the Mechanical Behavior of Biomedical Materials
JF - Journal of the Mechanical Behavior of Biomedical Materials
SN - 1751-6161
ER -