Table 5. Correlation between MR imaging quantification of cranial cruciate ligament properties and arthroscopic and histologic assessment.

	CrCL FSE Volume		CrCL FSE Grayscale		CrCL VIPR Volume		CrCL VIPR Grayscale		CrCL T1 Enhance
	SR	P value	SR	P value	SR	P value	SR	P value	SR	P value
Complete CR Stifle
Histologic Synovitis Grade	-0.08	0.64	-0.03	0.86	n/a		n/a		n/a
Histologic Synovitis VAS	0.07	0.71	-0.02	0.91	n/a		n/a		n/a
Partial CR Stifle
Histologic Synovitis Grade	0.10	0.60	0.50	0.007	0.02	0.93	0.36	0.12	-0.28	0.14
Histologic Synovitis VAS	0.05	0.81	0.50	0.006	-0.21	0.37	0.32	0.17	-0.43	0.02
Arthroscopic Fiber Damage VAS	0.05	0.81	0.34	0.08	0.05	0.84	0.11	0.62	-0.21	0.27

Note: Arthroscopic fiber damage VAS assesses ligament fiber rupture in the cranial cruciate ligament in the partial CR stifle. FSE and VIPR grayscale values were normalized to the cranial tibial muscle. FSE and VIPR volume measurements were normalized to patellar length. n = 28 dogs for all CrCL FSE and T1 Enhance comparisons; n = 20 for all CrCL VIPR comparisons. Abbreviations: CR, cruciate ligament rupture; CrCL, cranial cruciate ligament; FSE, fast spin echo; VIPR, Vastly under-sampled Isotropic Projection; VAS, visual analogue scale score.