Table 4.

Changes over time in combined acetabular and femoral dGEMRIC indices after surgery and nonoperative treatment

Region	Group	Time point	Mean dGEMRIC index (ms)*	p value
				Baseline versus followup	Groups at baseline	Groups at followup	Change between groups	Change between region
Acetabulum	Nonoperative	Baseline	505 ± 171	0.006	0.472	< 0.001	< 0.001	0.739
		Followup	489 ± 178
		Change	−16 ± 101
	Operative	Baseline	521 ± 197	< 0.001				0.69
		Followup	424 ± 165
		Change	−96 ± 112
Femur	Nonoperative	Baseline	462 ± 137	< 0.001	0.298	< 0.001	< 0.001
		Followup	441 ± 141
		Change	−21 ± 83
	Operative	Baseline	488 ± 174	< 0.001
		Followup.	392 ± 125
		Change	−96 ± 123

^*Values are mean ± SD; means of peripheral and central regions of interest per hour position were used for calculation; for comparing changes over time between the acetabular and femoral cartilage, the difference between baseline and followup dGEMRIC indices was calculated at each clockface position; dGEMRIC = delayed gadolinium-enhanced MRI of cartilage.