Table 3.
Summary of mean WORMS sores regarding individual parameters and total score for the patellofemoral joint and the femorotibial joint, depending on trochlea depth, medial-to-lateral trochlea facetal ratio and sulcus angle.
| A: | Trochlear depth | Facetal ratio | Sulcus angle | |||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Compartment | Parameter | Shallow n=85 | Normal n=50 | Difference (Lower 95% CI; Upper 95% CI) | Abnormal n=30 | Normal n=105 | Difference (Lower 95% CI; Upper 95% CI) | Abnormal n=22 | Normal n=113 | Difference (Lower 95% CI; Upper 95% CI) |
| Patellofemoral | Total WORMS | 11.2 ×0.5 | 5.7 ×0.6 | 5.5 (3.9; 7.0)* | 12.3 ×0.9 | 8.3 ×0.5 | 3.9 (1.9; 6.0)* | 12.2 ×1.1 | 8.6 ×0.6 | 3.7 (1.3; 6.1)* |
| Patella | Cartilage | 4.5 ×0.2 | 3.1 ×0.2 | 1.4 (0.9; 1.9)* | 4.9 ×0.3 | 3.7 ×0.2 | 1.2 (0.5; 1.8)* | 4.8 ×0.3 | 3.8 ×0.2 | 1.1 (0.4; 1.8)* |
| Trochlea | Cartilage | 3.5 ×0.2 | 1.6 ×0.3 | 1.9 (1.2; 2.5)* | 4.0 ×0.2 | 2.5 ×0.2 | 1.5 (0.7; 2.3)* | 3.7 ×0.5 | 2.6 ×0.2 | 1.1 (0.1; 2.0)* |
| Medial femorotibial | Total WORMS | 7.4 ×0.7 | 5.0 ×0.9 | 2.5 (0.4; 4.5)* | 6.1 ×1.1 | 6.6 ×0.6 | 0.4 (−2.0; 2.9) | 8.0 ×1.3 | 6.2 ×0.7 | 1.7 (−1.1; 4.5) |
| Meniscus | 2.2 ×0.2 | 1.9 ×0.3 | 0.4 (−0.4; 1.1) | 1.5 ×0.4 | 2.3 ×0.2 | 0.8 (−0.1; 1.7) | 1.9 ×0.5 | 2.2 ×0.3 | 0.4 (−0.7; 1.4) | |
| Cartilage (Sum) | 4.0 ×0.3 | 2.6 ×0.4 | 1.4 (0.4; 2.5)* | 3.7 ×0.6 | 3.4 ×0.3 | 0.3 (−1.0; 1.5) | 4.3 ×0.7 | 3.3 ×0.4 | 0.9 (−0.5; 2.4) | |
| Lateral femorotibial | Total WORMS | 6.4 ×0.6 | 4.8 ×0.8 | 1.7 (−0.4; 3.7) | 6.3 ×1.1 | 5.7 ×0.6 | 0.6 (−1.8; 3.1) | 8.2 ×1.3 | 5.4 ×0.7 | 3.0 (0.4; 5.7)* |
| Meniscus | 2.2 ×0.2 | 1.6 ×0.3 | 0.6 (−0.1; 1.3) | 2.2 ×0.4 | 1.9 ×0.2 | 0.3 (−0.6; 1.2) | 2.9 ×0.4 | 1.8 ×0.2 | 1.2 (0.3; 2.2)* | |
| Cartilage (Sum) | 3.7 ×0.4 | 2.9 ×0.5 | 0.8 (−0.4; 2.0) | 3.6 ×0.6 | 3.3 ×0.3 | 0.3 (−1.1; 1.7) | 4.5 ×0.7 | 3.2 ×0.4 | 1.5 (−0.1; 3.0) | |
| B: | Trochlear depth | Facetal ratio | Sulcus angle | |||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Compartment | Parameter | Shallow n=85 | Normal n=50 | Odds ratio (Lower 95% CI; Upper 95% CI) | Abnormal n=30 | Normal n=105 | Odds ratio (Lower 95% CI Upper 95% CI) | Abnormal n=22 | Normal n=113 | Odds ratio (Lower 95% CI; Upper 95% CI) |
| Patella | BME | 65/85 | 20/50 | 5.2 (1.4; 11.8)* | 24/30 | 61/105 | 3.0 (1.2; 8.8)* | 19/22 | 66/113 | 5.7 (1.7; 26.4)* |
| Cyst | 17/85 | 0/50 | − (6.5; -)* | 4/30 | 13/105 | 1.0 (0.2; 3.3) | 6/22 | 11/113 | 4.1 (1.2; 13.9)* | |
| Trochlea | BME | 46/85 | 11/50 | 4–4 (2.0; 5.7)* | 20/30 | 37/105 | 3.7 (1.6; 9.1)* | 14/22 | 43/113 | 2.5 (1.0; 6.9) |
| Cyst | 19/85 | 0/50 | − (7.1; -)* | 8/30 | 11/105 | 2.9 (1.0; 8.3)* | 6/22 | 13/113 | 2.5 (0.8; 7.8) | |
| Medial femorotibial | Medial BME | 27/85 | 9/50 | 2.2 (1.0; 0.9) | 11/30 | 25/105 | 2.1 (0.8; 5.2) | 10/22 | 26/113 | 3.2 (1.1; 9.4)* |
| Medial Cyst | 5/85 | 1/50 | − (0.4; -) | 0/30 | 6/105 | 0.0 (0; 5.8) | 3/22 | 3/113 | 17.4 (2.1; 187.8)* | |
| Lateral femorotibial | Lateral BME | 12/85 | 6/50 | 1.2 (0.4; 3.8) | 4/30 | 14/105 | 1.1 (0.3; 3.4) | 5/22 | 13/113 | 2.9 (0.8; 10.1) |
| Lateral Cyst | 4/85 | 2/50 | 1.3 (0.2;9.8) | 2/30 | 4/105 | 0.0 (0; 3.5) | 1/22 | 5/113 | 1.9 (0.1; 15.2) | |
BME=bone marrow edema pattern; Multivariate regression analysis
*
P<0.05
A: Adjusted1 means × SEM and differences are presented for numeric outcomes.
B: The ratio n (abnormal scores)/ n (total) is presented for dichotomous variables (ratios are not adjusted; P-values, odds ratios and confidence intervals are adjusted1).
1
All regression models were adjusted for age, gender and OA risk factors, including previous injury or surgery at the knee, family history of joint replacement, presence of Herbeden's nodes and BMI.