Background
Methods
All | PSZ | ASZ | P value | |
---|---|---|---|---|
Number of Hips | 91 | 23 | 68 | |
Gender (men/women) | 8/83 | 2/21 | 6/62 | >0.999 |
Age (years) | 59 | 64 | 57 | 0.02 |
Body Mass Index (kg/m2) | 23.4 | 24.1 | 23.2 | 0.32 |
Diagnosis | ||||
Osteoarthritis | 75 | 16 | 58 | 0.21 |
ION | 10 | 5 | 6 | |
Rheumatoid Arthritis | 6 | 2 | 4 | |
Polyethylene Thickness (mm) | 11 | 10.7 | 11.5 | 0.020 |
Results
Clinical results
Polyethylene wear
Retrieval study
Cause of Revision | Zirconia Material | Duration (years) | Transformation rate (%) | Surface roughness Ra (μm) |
---|---|---|---|---|
Infection | PSZ | 2.3 | 51 | 0.06 |
Dislocation | ASZ | 1.5 | 7 | 0.03 |
ASZ | 3.2 | 7 | <0.01 | |
Unused | PSZ | 4 | 0.01 | |
ASZ | 3 | <0.01 |
Discussion
N | Duration | Transformation rate | Surface roughness | |
---|---|---|---|---|
(years) | (%) | Ra (μm) | ||
Hayaishi et al. [24] | 1 | 1 | 13 | 0.01 |
Hernigou et al. [26] | 3 | 8-11 | 30 | 0.05 |
Haraguchi et al. [27] | 2 | 3, 6 | 37 | 0.12 |
Roy et al. [23] | 7 | 0.04-11 | 49 | 0.03 |
Fernandez-Fairen et al. [8] | 47 | 2-10 | 65 | 0.30 |
Santos et al. [28] | 18 | 0.2-10 | 70 | 0.04 |
Present study | 3 | 1.5-3 | 51 | 0.06 |
Mean Followup | Penetration Rate (mm/year) | P value | |||
---|---|---|---|---|---|
(years) | Yttria Stabilized Zirconia | Cobalt Chromium | Alumina | ||
Stilling et al. [20] | 5 | 0.23 | 0.25 | 0.46 | |
Cohn et al. [9] | 4 | 0.14 | 0.11 | 0.07 | |
Kim [4] | 7 | 0.08 | 0.17 | 0 | |
Kraay et al. [31] | 4 | 0.06 | 0.05 | n.a.** | |
Nakahara et al. [13] | 7 | 0.03* | 0.03* | 0.77 | |
Hernigou et al. [26] | 5 | 0.04 | 0.04 | n.a.** | |
12 | 0.41 | 0.07 | 0.01 | ||
Liang et al. [10] | 5 | 0.13 | 0.08 | <0.01 |
Polyethylene | Zirconia | N | Mean followup | Steady-state wear rate | P value | ||
---|---|---|---|---|---|---|---|
(years) | Yttria stabilized zirconia | Cobalt chromium | |||||
(mm/year) | |||||||
Nakahara et al. [13] | Longevity (Zimmer) | (NGK) | 51 | 7 | −0.01 | −0.01 | 0.83 |
Kawate et al. [16] | Aeonian (JMM) | (JMM) | 32 | 5 | 0.00 | 0.01 | 0.36 |
Fukui et al. [17] | Longevity (Zimmer) | (NGK) | 45 | 5 | 0.01 | ||
Miyanishi et al. [15] | Aeonian (JMM) | (JMM) | 95 | 2 | 0.06 | ||
Present study | Excellink (JMM) | (JMM) | 91 | 7 | 0.02 |