In Vivo Quantitative Ultrasound Image Analysis of Femoral Subchondral Bone in Knee Osteoarthritis

Table 1

Spearman’s rank correlations (𝑟) between ultrasound medial (MED), sulcus (SULC), and lateral (LAT) bone depth level 2 intensities and intensity slopes and radiographic K-L grading or arthroscopic Noyes’ grading.

	K-L grading			Noyes’ grading
	𝑛	𝑟	95% CI	𝑛	𝑟	95% CI
MED level 2	31	0.419*	0.076–0.673	38	0.292	−0.031–0.559
SULC level 2	30	0.541**	0.224–0.754	38	0.372*	0.059–0.618
LAT level 2	31	0.117	−0.248–0.452	38	−0.038	−0.353–0.285
MED slope	31	0.360*	0.006–0.634	38	0.325*	0.006–0.584
SULC slope	30	0.482**	0.147–0.718	38	0.427**	0.124–0.657
LAT slope	31	−0.049	−0.396–0.311	38	−0.095	−0.402–0.232

^∗𝑃<0.05.
^∗∗𝑃<0.01.