Table 4.

Longitudinal (4-Year) Change in OAI Healthy Reference Cohort Participant Knees with and without MRI-Detected Femoropatellar Cartilage Damage (in the Absence of Femorotibial Cartilage Damage) ^a .

	Knees without Any Femoropatellar Cartilage Damage		Knees with Any Femoropatellar Cartilage Damage		P Value
	Mean	SD	Mean	SD
Change score (µm)	1004	336	1098	224	0.27
Thinning score (µm)	−492	348	−538	270	0.62
Thickening score (µm)	511	388	559	286	0.63
FTJ (µm)	21	160	20	129	0.98
MFTC (µm)	29	104	27	71	0.93
LFTC (µm)	−8	70	−7	82	0.97
cMFTC (µm)	35	149	9	116	0.51
cLFTC (µm)	29	118	26	112	0.9
PASE	3.42	66.3	−19.3	66.3	0.26
WOMAC Fct	−0.53	2.87	−0.15	0.83	0.53
CST Pace (stands/s)	−0.01	0.01	0.05	0.03	0.06
20m Pace (m/s)	0.05	−0.04	0.00	0.00	0.17

^aAbbreviations: See Table 3 .