Quantitative analysis of the ACL and PCL using T1rho and T2 relaxation time mapping: an exploratory, cross-sectional comparison between OA and healthy control knees

Table 4 Summary of T1rho and T2 variables by ACL and PCL subregion for OA and controls

			Distal		Middle		Proximal		Variation across ligament
Group	Ligament	Parameter	Mean (SD)	Sig.	Mean (SD)	Sig.	Mean (SD)	Sig.	p-values	Effect size
OA	ACL	T1rho	54.5 (9.9)	M, P	46.9 (9.6)	D	47.0 (6.9)	D	< 0.001	0.430
	ACL	T2	43.2 (9.4)	P	38.0 (8.3)		37.0 (5.0)	D	0.017*	0.271***
	PCL	T1rho	33.8 (3.2)		34.2 (3.0)		33.9 (5.2)		0.881**	0.005
	PCL	T2	28.5 (4.5)		29.1 (2.8)		28.7 (3.4)		0.748	0.021
Controls	ACL	T1rho	53.2 (13.4)		52.4 (12.4)		51.3 (7.5)		0.855	0.031
	ACL	T2	39.9 (12.5)		40.5 (10.3)		40.3 (3.7)		0.987	0.003
	PCL	T1rho	33.9 (3.2)		35.3 (4.9)		34.5 (4.0)		0.790	0.046
	PCL	T2	26.4 (2.3)	M, P	32.7 (3.8)	D	33.3 (5.2)	D	0.009*	0.778***

NOTE: Means and standard deviations (SD) are in ms. Within the (Sig.) column: M = different from middle; P = different from proximal; D = different from distal (all p < 0.05); * = A Friedman test was used here; ** = p-value after Greenhouse-Geiser correction; all effect sizes are partial-eta squared values unless indicated by a *** which represents a Kendall’s co-efficient of concordance value; p-values < 0.05 are shown in bold. ACL = Anterior cruciate ligament; PCL = Posterior cruciate ligament

ISSN: 1471-2474