Table 2.

MRI synovitis grades in early and end-stage knee OA patients.

	All patients	Early OA	End-stage OA
Supra parapatellar	1.27 ± 0.11	1.26 ± 0.15	1.27 ± 0.16
Infra parapatellar	1.04 ± 0.11	0.89 ± 0.15	1.23 ± 0.15
Intercondylar	1.74 ± 0.08	1.63 ± 0.13	1.86 ± 0.07
Medial parapatellar	1.57 ± 0.08	1.52 ± 0.10	1.64 ± 0.12
Lateral parapatellar	1.49 ± 0.10	1.37 ± 0.15	1.64 ± 0.12
Adjacent to ACL	1.35 ± 0.08	1.26 ± 0.11	1.46 ± 0.11
Adjacent to PCL	1.82 ± 0.06	1.74 ± 0.10	1.91 ± 0.06
Lateral parameniscal	1.59 ± 0.08	1.56 ± 0.11	1.64 ± 0.11
Medial parameniscal	1.25 ± 0.11	0.93 ± 0.15	1.65 ± 0.12
Bakers cysts	0.89 ± 0.14	0.85 ± 0.18	0.95 ± 0.21
Loose bodies	0.35 ± 0.11	0.07 ± 0.07	0.68 ± 0.20
Parapatellar total	7.10 ± 0.29 ‡	6.67 ± 0.42 ‡	7.64 ± 0.39 ‡*
Paraligamentous total	3.16 ± 0.11	3.00 ± 0.16	3.36 ± 0.14
Parameniscal total	2.84 ± 0.15	2.48 ± 0.22	3.27 ± 0.15
Total	14.35 ± 0.42	13.07 ± 0.52	15.91 ± 0.51 ψ
% Normal (0–4)	-	-	-
% Mild (5–8)	2%	4%	-
% Moderate (9–11)	29%	48%	5%
% Severe (> 13)	69%	48%	95%

Values represent synovitis grade (0, 1 or 2) mean ± SEM for All patients (n = 51), early OA patients (n = 29) and end-stage OA patients (n = 22).

^‡= p < 0.001, significantly different from paraligamentous total and parameniscal total.

^⁎= p < 0.01, significantly different between early and end-stage OA.

^ψ= p < 0.001, significantly different between early and end-stage OA.