Table 3.
Compartmental prevalence (% of knees) of MRI-based definitions* among BMI and age categories
| Prevalence (95% CI) of compartment involvement | ||||
|---|---|---|---|---|
|
| ||||
| Knees | Isolated PFJ | Isolated TFJ | Mixed | |
| BMI Categories | ||||
| Definition 1 | ||||
| <25 | 261 | 22.6(17.5,27.7) | 8.8(5.4,12.3) | 39.5(33.5,45.4) |
| 25-29 | 383 | 20.4(16.3,24.4) | 12.0(8.8,15.3) | 43.9(38.9,48.8) |
| 30-34 | 197 | 18.8(13.3,24.2) | 10.7(6.4,15.0) | 45.7(38.7,52.6) |
| >35 | 116 | 17.2(10.4,24.1) | 8.6(3.5,13.7) | 54.3(45.2,63.4) |
| Definition 2 | ||||
| <25 | 261 | 16.9(12.3,21.4) | 6.5(3.5,9.5) | 4.2(1.8,6.7) |
| 25-29 | 383 | 18.0(14.2,21.9) | 9.1(6.3,12.0) | 7.0(4.5,9.6) |
| 30-34 | 197 | 21.3(15.6,27.0) | 6.1(2.8,9.4) | 9.6(5.5,13.8) |
| >35 | 116 | 19.0(11.8,26.1) | 11.2(5.5,16.9) | 14.7(8.2,21.1) |
| Definition 3 | ||||
| <25 | 261 | 16.5(12.0,21.0) | 16.1(11.6,20.5) | 19.5(14.7,24.4) |
| 25-29 | 383 | 18.3(14.4,22.1) | 18.5(14.6,22.4) | 21.1(17.1,25.2) |
| 30-34 | 197 | 18.3(12.9,23.7) | 18.3(12.9,23.7) | 21.8(16.1,27.6) |
| >35 | 116 | 18.1(11.1,25.1) | 7.8(2.9,12.6) | 30.2(21.8,38.5) |
| Definition 4 | ||||
| <25 | 261 | 19.9(15.1,24.8) | 11.5(7.6,15.4) | 16.9(12.3,21.4) |
| 25-29 | 383 | 19.8(15.8,23.8) | 14.9(11.3,18.4) | 18.8(14.9,22.7) |
| 30-34 | 197 | 19.8(14.2,25.4) | 14.7(9.8,19.7) | 20.3(14.7,25.9) |
| >35 | 116 | 21.6(14.1,29.0) | 6.9(2.3,11.5) | 27.6(19.5,35.7) |
| Definition 5 | ||||
| <25 | 261 | 13.0(8.9,17.1) | 6.5(3.5,9.5) | 3.4(1.2,5.7) |
| 25-30 | 383 | 15.7(12.0,19.3) | 9.1(6.3,12.0) | 5.5(3.2,7.8) |
| 30-35 | 197 | 18.8(13.3,24.2) | 8.6(4.7,12.6) | 5.1(2.0,8.1) |
| >35 | 116 | 17.2(10.4,24.1) | 11.2(5.5,16.9) | 9.5(4.2,14.8) |
| Age Categories | ||||
| Definition 1 | ||||
| 50-59 | 389 | 22.9(18.7,27.1) | 10.0(7.0,13.0) | 32.4(27.7,37.0) |
| 60-69 | 340 | 20.0(15.7,24.3) | 10.9(7.6,14.2) | 47.9(42.6,53.3) |
| >70 | 241 | 17.0(12.3,21.8) | 10.4(6.5,14.2) | 58.1(51.9,64.3) |
| Definition 2 | ||||
| 50-59 | 261 | 16.7(13.0,20.4) | 4.9(2.7,7.0) | 4.1(2.1,6.1) |
| 60-69 | 383 | 18.8(14.7,23.0) | 9.4(6.3,12.5) | 9.4(6.3,12.5) |
| >70 | 241 | 21.2(16.0,26.3) | 11.2(7.2,15.2) | 11.6(7.6,15.7) |
| Definition 3 | ||||
| 50-59 | 389 | 18.3(14.4,22.1) | 16.2(12.5,19.9) | 13.9(10.4,17.3) |
| 60-69 | 340 | 17.9(13.9,22.0) | 16.2(12.3,20.1) | 24.4(19.8,29.0) |
| >70 | 241 | 17.4(12.6,22.2) | 17.4(12.6,22.2) | 30.7(24.9,36.5) |
| Definition 4 | ||||
| 50-59 | 389 | 20.6(16.5,24.6) | 10.3(7.3,13.3) | 10.8(7.7,13.9) |
| 60-69 | 340 | 20.6(16.3,24.9) | 13.2(9.6,16.8) | 22.6(18.2,27.1) |
| >70 | 241 | 19.1(14.1,24.0) | 17.0(12.3,21.8) | 29.0(23.3,34.8) |
| Definition 5 | ||||
| 50-59 | 389 | 14.7(11.1,18.2) | 5.4(3.2,7.6) | 2.1(0.6,3.5) |
| 60-69 | 340 | 15.3(1.5,19.1) | 9.7(6.6,12.9) | 7.1(4.3,9.8) |
| >70 | 241 | 18.7(13.8,23.6) | 12.4(8.3,16.6) | 8.3(4.8,11.8) |
*
Definitions: 1) any cartilage damage (WORMS ≥2; focal cartilage defect or superficial cartilage loss not extending to bone); 2) full thickness cartilage loss (WORMS 2.5, ≥5; cartilage loss extending to bone); 3) any bone marrow lesion (WORMS ≥1); 4) the combination of any cartilage damage with any BML; 5) the combination of full thickness cartilage loss with any BML