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Table 1 Presence and relative risk of progression of cartilage damage, Hoffa-synovitis and effusion-synovitis in different knee compartments for all visits combined from baseline to 12 months

From: Structural effects of intra-articular TGF-β1 in moderate to advanced knee osteoarthritis: MRI-based assessment in a randomized controlled trial

  

Number of subjects who had follow-up visits and included in analysis

Number of subjects with MRI progression

Analysis adjusted for age and gender

Compartment

Definition

T a

P

T

P

RR (95% CI)

p-value

Knee

Progression in any subregion

133

71

46 (34.6%)

34 (47.9%)

0.7 (0.5,1.1)

0.077

 

Delta Subregion > 0

123

71

43 (35.0%)

32 (45.1%)

0.8 (0.5,1.2)

0.207

 

Delta Sum > 0

123

71

26 (21.1%)

23 (32.4%)

0.6 (0.3,1.2)

0.176

Lateral TFJ

Progression in any subregion

133

71

20 (15.0%)

12 (16.9%)

0.8 (0.3,1.9)

0.617

 

Delta Subregion > 0

128

71

20 (15.6%)

12 (16.9%)

0.8 (0.4,1.9)

0.680

 

Delta Sum > 0

128

71

13 (10.2%)

10 (14.1%)

0.7 (0.2,1.9)

0.434

Medial TFJ

Progression in any subregion

133

71

23 (17.3%)

12 (16.9%)

1.1 (0.5,2.5)

0.767

 

Delta Subregion > 0

133

71

23 (17.3%)

12 (16.9%)

1.1(0.5,2.5)

0.767

 

Delta Sum > 0

133

71

16 (12.0%)

5 (7.0%)

1.9(0.5,7.2)

0.345

PF

Progression in any subregion

131

71

18(13.7%)

16(22.5%)

0.6(0.3,1.3)

0.176

 

Delta Subregion > 0

128

71

17(13.3%)

15(21.1%)

0.6(0.3,1.3)

0.210

 

Delta Sum > 0

128

71

10(7.8%)

10(14.1%)

0.5(0.2,1.9)

0.327

MRI feature

Definition

T

P

T

P

RR (95% CI)

p-value

Hoffa-synovitis/ Effusion-synovitis combined

Any worsening

136

71

13 (9.6%)

15 (21.1%)

0.5 (0.2,1.2)

0.115

Hoffa-synovitis

Any worsening

133

71

4 (3.0%)

5 (7.0%)

0.3 (0.1,1.8)

0.200

Effusion-synovitis

Any worsening

136

71

12 (8.8%)

11 (15.5%)

0.6 (0.2,2.0)

0.428

  1. T treatment group, P placebo group, TFJ tibiofemoral joint, RR relative risk
  2. aNote: We excluded knees with MRI score missing in any subregion at either baseline or follow-up visit when defining delta subregion and delta sum, but did not exclude these knees when defining progression in any subregion. So N used for progressoin in any subregion was equal to or larger than N used in the two delta approaches