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Table 1 Accuracy of the model-based technique for tracking the patella and femur was expressed in terms of bias and precision as mean ± standard deviation.

From: Accuracy of biplane x-ray imaging combined with model-based tracking for measuring in-vivo patellofemoral joint motion

  Bias Precision Overall Dynamic Accuracy
Axis Patella Femur Patella Femur Patella Femur
X -0.014 ± 0.133 0.207 ± 0.099 0.061 ± 0.027 0.049 ± 0.011 0.220 ± 0.044 0.234 ± 0.064
Y -0.174 ± 0.114 -0.022 ± 0.125 0.062 ± 0.028 0.038 ± 0.005 0.211 ± 0.035 0.149 ± 0.048
Z 0.248 ± 0.158 0.218 ± 0.099 0.042 ± 0.007 0.023 ± 0.004 0.335 ± 0.127 0.276 ± 0.062