Table 2.

Few significant differences were seen between the contact path characteristics (mean − SD, units mm or mm²) of TKRs tested on a knee simulator and predictions by the shortest distance method (SDM) and the contour distance method (CDM). The centroid coordinates refer to the centroid of the Hertz contact area calculated for the entire contact path. AP and ML stretch refer to the AP and ML length of the box bounding the entire contact path. Centroid coordinates correspond to Figure 2.

	Simulator		SDM Hertz Solution		CDM Hertz Solution		p Simulator-SDM		p Simulator-CDM
	Medial	Lateral	Medial	Lateral	Medial	Lateral	Medial	Lateral	Medial	Lateral
ML Centroid	-20 − 1.1	18 − 0.8	-21 − 0.1	21 − 0.1	-19 − 0.3	21 − 0.3	0.02	0.29	0.29	0.05
AP Centroid	25 − 1.2	17 − 0.8	25 − 0.5	18 − 0.1	27 − 0.8	18 − 0.6	0.55	0.65	0.26	0.16
ML stretch	20 − 5.0	22 − 3.6	19 − 0.1	18 − 0.1	22 − 0.6	20 − 0.5	0.19	0.73	0.58	0.26
AP stretch	22 − 0.50	18 − 2.6	16 − 0.4	17 − 0.6	20 − 1.4	18 − 1.0	0.35	0.002	0.08	0.72
Area	267 − 65	261 − 41	240 − 9.8	528 − 6.6	346 − 25	287 − 12	0.94	0.57	0.23	0.38