Wear Scar Similarities between Retrieved and Simulator-Tested Polyethylene TKR Components: An Artificial Neural Network Approach
Table 2
Summary of geometric parameters for retrieved and simulator components. Bold values denote a significant () and meaningful ( > ) association with input variables “time in host” and “age at surgery.”
Mean (StDev)
Medial
Lateral
Cluster number
Area (mm2)
Perimeter (mm)
ML stretch (mm)
AP stretch (mm)
Area (mm2)
Perimeter (mm)
ML stretch (mm)
AP stretch (mm)
1
391.84 (135.11)
79.18 (13.54)
23.59 (3.51)
21.87 (6.03)
460.96 (166.04)
84.25 (12.78)
−12.77 (20.80)
25.64 (4.97)
2
498.21 (78.26)
83.56 (4.40)
24.39 (4.66)
26.15 (3.32)
566.35 (80.80)
89.47 (2.84)
12.25 (28.34)
27.06 (1.99)
3
712.27 (185.35)
100.02 (12.20)
26.87 (2.88)
32.92 (5.23)
754.24 (180.98)
102.73 (11.72)
0.93 (29.67)
33.26 (5.72)
4
416.07 (146.55)
78.78 (1.51)
23.12 (3.37)
23.68 (4.87)
421.97 (165.74)
79.01 (12.56)
−3.67 (26.80)
22.86 (6.32)
5
283.47
62.59
22.63
16.71
337.01
67.39
−20.51
21.38
6
418.87 (101.98)
77.46 (6.04)
21.78 (0.63)
24.22 (3.62)
412.37 (121.97)
76.86 (10.95)
−23.54 (2.06)
22.74 (3.61)
7
355.69
71.44
19.39
23.58
436.42
76.99
−26.19
21.71
8
179.84 (34.29)
54.08 (6.05)
17.21 (1.75)
14.83 (3.31)
143.83 (76.49)
46.72 (12.10)
3.17 (15.72)
13.87 (3.19)
9
374.52 (108.82)
75.28 (9.46)
23.33 (3.76)
21.05 (4.33)
392.90 (124.16)
74.99 (10.18)
3.62 (23.54)
21.97 (5.55)
10
363.73 (15.08)
73.69 (0.83)
22.83 (3.82)
21.21 (5.66)
308.54 (46.11)
68.10 (6.71)
−7.98 (28.02)
16.16 (3.08)
11
129.36 (88.82)
45.12 (18.78)
13.76 (5.50)
13.53 (6.04)
241.70 (136.61)
58.06 (26.35)
8.61 (15.45)
16.62 (7.67)
StDev = standard deviation, ML stretch = medial-lateral stretch, and AP stretch = anterior-posterior stretch. StDev not available, (cluster) = 1.
