Table 3.
Correlation between device and patient factors and cumulative rate of volumetric material loss in the CoCr cohort
| Variable | Spearman’s correlation (ρ) | p value (significant if < 0.05) |
|---|---|---|
| Device factors | ||
| Taper angle clearance* [16] | 0.06 | 0.70 |
| Absolute taper angle clearance* [16] | 0.20 | 0.16 |
| Head size | 0.05 | 0.72 |
| Head offset | 0.15 | 0.29 |
| Lateral offset | 0.26 | 0.07 |
| Stem taper material | – | 0.71 (Kruskal-Wallis) |
| Stem taper surface finish | – | 0.20 (Mann-Whitney U) |
| Patient factors | ||
| Implantation time | 0.19 | 0.18 |
| Patient age at implantation | −0.06 | 0.35 |
| BMI | 0.23 | 0.07 |
| UCLA Activity Score | 0.15 | 0.16 |
| Sex | – | 0.06 (Mann-Whitney U) |
* The absolute value of previously estimated taper angle clearance for head-stem junctions, looking at the effect of the net gap on material loss [16].