Table 2 Matrix of Spearman correlation coefficients and P values (in brackets) for the association among assessment methods of bone quality (intra-surgical tactile perception, preoperative CT visual evaluation, preoperative CT mean gray values (MGVs)) and primary stability (insertion torque)
Variables | Torque | Tactile | CT visual | MGV_avg | MGV_axial | MGV_cor | MGV_sag |
|---|---|---|---|---|---|---|---|
Torque | – | − 0.770 (< 0.001) | − 0.415 (0.017) | 0.677 (< 0.001) | 0.620 (< 0.001) | 0.629 (< 0.001) | 0.607 (< 0.001) |
Tactile | − 0.770 (< 0.001) | – | 0.342 (0.052) | − 0.670 (< 0.001) | − 0.643 (< 0.001) | − 0.697 (< 0.001) | − 0.469 (0.006) |
CT visual | − 0.415 (0.017) | 0.342 (0.052) | – | − 0.516 (0.002) | − 0.518 (0.002) | − 0.483 (0.005) | − 0.421 (0.015) |
MGV_avg | 0.677 (< 0.001) | − 0.670 (< 0.001) | − 0.516 (0.002) | – | 0.970 (< 0.001) | 0.939 (< 0.001) | 0.848 (< 0.001) |
MGV_axial | 0.620 (< 0.001) | − 0.643 (< 0.001) | − 0.518 (0.002) | 0.970 (< 0.001) | – | 0.926 (< 0.001) | 0.741 (< 0.001) |
MGV_coronal | 0.629 (< 0.001) | − 0.697 (< 0.001) | − 0.483 (0.005) | 0.939 (< 0.001) | 0.926 (< 0.001) | – | 0.671 (< 0.001) |
MGV_sagittal | 0.607 (< 0.001) | − 0.469 (0.006) | − 0.421 (0.015) | 0.848 (< 0.001) | 0.741 (< 0.001) | 0.671 (< 0.001) | – |