Table 2.

Accuracy of the model-based technique (RMS errors, mean ± standard deviation) expressed in kinematic parameters that describe motion of the patella relative to the femur.

Kinematic Parameter	Bias	Precision	Overall Dynamic Accuracy
Shift (med/lat translation)	0.320 ± 0.105 mm	0.114 ± 0.039 mm	0.395 ± 0.079 mm
Anterior/posterior translation	-0.293 ± 0.201 mm	0.042 ± 0.011 mm	0.340 ± 0.162 mm
Superior/inferior translation	-0.107 ± 0.312 mm	0.058 ± 0.026 mm	0.315 ± 0.126 mm
Flexion	0.475 ± 0.420°	0.216 ± 0.139°	0.875 ± 0.237°
Tilt	-0.052 ± 0.651°	0.322 ± 0.214°	0.863 ± 0.156°
Rotation	-0.090 ± 0.290°	0.382 ± 0.239°	0.877 ± 0.090°