Knee varus alters three-dimensional ankle alignment in standing- a study with upright computed tomography

Table 4 Correlation between the knee joint and subtalar joint in each grade of knee OA

Joint Plane			Correlation coefficient (P value)
Knee	Subtalar	Chart	All	KL-I	KL-II	KL-III	KL-IV
Sagittal	Sagittal	a)	−0.073	0.218	−0.216	− 0.385	−0.430
	Sagittal	a)	(0.633)	(0.520)	(0.523)	(0.243)	(0.163)
	Coronal	b)	−0.074	0.208	−0.591	0.026	−0.360
	Coronal	b)	(0.627)	(0.539)	(0.055)	(0.940)	(0.251)
	Axial	c)	−0.196	0.141	0.284	−0.552	0.149
	Axial	c)	(0.198)	(0.680)	(0.398)	(0.078)	(0.644)
Coronal	Sagittal	d)	−0.191	−0.056	0.125	−0.629*	−0.034
	Sagittal	d)	(0.208)	(0.871)	(0.713)	(0.038)	(0.917)
	Coronal	e)	−0.119	−0.220	0.634*	0.053	−0.491
	Coronal	e)	(0.436)	(0.515)	(0.036)	(0.878)	(0.105)
	Axial	f)	−0.153	0.006	− 0.147	0.129	0.580*
	Axial	f)	(0.315)	(0.460)	(0.399)	(0.347)	(0.046)
Axial	Sagittal	g)	0.072	0.141	0.455*	−0.552	0.149
	Sagittal	g)	(0.640)	(0.715)	(0.048)	(0.068)	(0.725)
	Coronal	h)	−0.997	−0.249	−0.283	− 0.314	0.580
	Coronal	h)	(0.211)	(0.987)	(0.665)	(0.280)	(0.091)
	Axial	i)	0.083	0.125	−0.491	0.387	0.043
	Axial	i)	(0.588)	(0.714)	(0.125)	(0.239)	(0.895)

* Indicates significance at P < 0.05
Pearson’s correlation coefficients and Spearman’s rank correlation coefficients were used to determine the relationship between the alignment of the knee joint and the subtalar joint. In KL-II, the angle of the axial plane of the knee joint and the angle of the sagittal plane of the subtalar joint were correlated, and the angle of the coronal plane of the knee joint and the angle of the coronal plane of the subtalar joint were correlated. In KL-III, the angle of the coronal plane of the knee joint and the angle of the sagittal plane of the subtalar joint were correlated. KL-IV, the angle of the coronal plane of the knee joint and the angle of the axial plane of the subtalar joint were correlated. In KL-I, there was no correlation between knee and talocrural joints

ISSN: 1471-2474