Table 3.
Mean (SD) values for Bland–Altman comparisons of peak angular velocity from Certus and IMUs for the three planes. On average, the Certus measurements tended to overestimate the IMU measurements. The percentage difference (Diff [%]) is defined in the table footnote.
| Certus [°/s] | IMU [°/s] | Certus-IMU [°/s] | LoA [°/s] | Diff [%] | |
|---|---|---|---|---|---|
| Sagittal plane | |||||
| Tibia | 182.3 (32.6) | 109.7 (31.5) | 72.7 (28.0) | (17.8, 127.5) | 75.4% (38.6%) |
| Femur | 159.7 (33.0) | 195.5 (41.7) | −35.8 (16.6) | (−68.3, −3.3) | −17.9% (6.5%) |
| Transverse plane | |||||
| Tibia | 673.4 (103.2) | 832.5 (120.2) | −159.1 (75.9) | (−308.0, −10.3) | −18.9% (7.3%) |
| Femur | 188.8 (45.3) | 300.8 (131.6) | −112.0 (97.1) | (−302.3, 78.2) | −31.8% (17.4%) |
| Frontal plane | |||||
| Tibia | 684.9 (117.5) | 148.6 (38.4) | 536.3 (95.8) | (348.5, 724.1) | 384.4% (121.6%) |
| Femur | 191.3 (65.1) | 90.9 (19.2) | 100.4 (60.2) | (−17.6, 218.4) | 115.5% (75.3%) |
LoA denotes limits of agreement; Diff [%] = .