Variability of TKR Knee Kinematics and Relationship with Gait Kinetics: Implications for Total Knee Wear
Table 1
Demographic and kinetic variables of low (LMG) and high (HMG) motion groups. One subject’s data from the AP HMG had to be excluded due to processing difficulties.
AP motion groups
IE motion groups
LMG
HMG
LMG
HMG
Design (MGII/NexGen)
5/10
4/10
0.683
5/10
5/10
1.0
Age (years)
67.6 ± 2.14
66.5 ± 2.72
0.780
68.7 ± 2.41
65.5 ± 2.42
0.461
BMI (kg/m2)
27.5 ± 1.34
30.2 ± 1.19
0.290
27.8 ± 1.33
30.0 ± 1.24
0.267
Implant in situ time (years)
5.6 ± 1.2
6.5 ± 1.2
0.949
6.02 ± 1.20
60.3 ± 1.20
0.775
Gender (M/F)
11 M/4 F
4 M/11 F
0.027
8 M/7 F
7 M/8 F
1.0
Total IE range from stance to swing (deg.)
16.33 ± 1.62
15.97 ± 1.93
0.561
NA
NA
NA
Total AP range from mid to terminal stance (mm)
NA
NA
NA
20.61 ± 2.60
22.52 ± 4.75
0.505
HS to MS knee flexion range (deg.)
18.38 ± 0.59
14.86 ± 1.02
0.023
16.81 ± 0.98
16.43 ± 0.92
0.744
Minimum knee flexion at heel-strike (deg.)
−0.350 ± 0.94
0.490 ± 1.33
0.621
1.69 ± 1.02
−1.58 ± 1.12
0.148
Toe-out angle (deg.)
21.4 ± 2.28
16.94 ± 2.04
0.057*
15.59 ± 1.59
22.79 ± 2.39
0.021
Peak flexion moment (%Bw. × Ht.)
2.36 ± 0.21
1.80 ± 0.20
0.037
NA
NA
NA
Max internal rotation moment (%Bw. × Ht.)
NA
NA
NA
0.857 ± 0.058
0.734 ± 0.092
0.233
Speed (m/s)
1.25 ± 0.053
1.20 ± 0.054
0.505
1.24 ± 0.03
1.20 ± 0.069
0.624
Stride length (m)
0.780 ± 0.021
0.773 ± 0.019
0.715
0.790 ± 0.012
0.762 ± 0.025
0.305
Cadence
109.60 ± 2.72
109.26 ± 2.50
0.880
110.36 ± 2.31
108.5 ± 2.89
0.412
Data are mean ± SEM, bold indicates , and *indicates borderline significance.
