Recovery of Posture Stability at Different Foot Placements in Patients Who Underwent Minimally Invasive Total Hip Arthroplasty: A One-Year Follow-Up Study
Table 2
Summary of two-way repeated measure ANOVA examining the interaction of time point and foot placement and subsequent post hoc analysis of parameters representing postural stability.
Time points
Foot placement
SWS
SSS
AFS
SFS
CoPR (unit: mm)
Presurgery
73.5 ± 18.6
64.7 ± 16.6
129.3 ± 39.2
124.7 ± 33.8
0.003
0.000
0.000
Postsurgery, 2 wk
81.8 ± 21.9
74.1 ± 14.8
141.8 ± 34.6
152.7 ± 37.1
Postsurgery, 6 wk
79.3 ± 23.7
66.1 ± 18.8
130.6 ± 37.4
130.1 ± 36.0
Postsurgery, 3 mo
79.2 ± 22.1
72.8 ± 18.5
133.4 ± 37.1
133.2 ± 27.8
Postsurgery, 6 mo
72.8 ± 14.5
60.5 ± 9.9
141.0 ± 30.5
129.6 ± 20.0
Postsurgery, 1 yr
57.0 ± 2.7
52.1 ± 2.6
117.2 ± 11.7
107.1 ± 3.5
CoPAP (unit: mm)
Presurgery
35.7 ± 10.0
48.1 ± 14.3
84.1 ± 44.3
57.6 ± 29.1
0.018
0.185
0.000
Postsurgery, 2 wk
41.1 ± 24.3
55.1 ± 15.8
76.6 ± 36.4
73.6 ± 23.9
Postsurgery, 6 wk
40.6 ± 25.0
55.4 ± 17.1
73.5 ± 39.7
74.8 ± 34.5
Postsurgery, 3 mo
36.3 ± 6.3
50.1 ± 10.2
86.2 ± 31.1
71.3 ± 22.5
Postsurgery, 6 mo
35.5 ± 5.3
53.5 ± 6.1
102.3 ± 14.3
89.2 ± 15.0
Postsurgery, 1 yr
33.6 ± 4.3
47.7 ± 5.0
104.3 ± 12.3
71.5 ± 8.8
CoPML (unit: mm)
Presurgery
22.9 ± 8.3
44.8 ± 10.42
65.3 ± 17.5
61.8 ± 19.0
0.003
0.000
0.005
Postsurgery, 2 wk
26.8 ± 10.3
41.9 ± 16.22
84.7 ± 31.5
67.3 ± 36.6
Postsurgery, 6 wk
22.7 ± 8.4
58.2 ± 25.02
55.9 ± 24.6
65.5 ± 35.3
Postsurgery, 3 mo
22.6 ± 10.5
52.0 ± 23.22
59.8 ± 12.0
58.1 ± 12.5
Postsurgery, 6 mo
21.9 ± 4.1
50.6 ± 8.42
88.7 ± 22.1
89.8 ± 14.8
Postsurgery, 1 yr
25.8 ± 3.0
50.6 ± 3.12
91.1 ± 14.4
78.9 ± 3.2
BWDSI (unit: % of body weight)
Presurgery
2.0 ± 6.7
6.4 ± 9.1
10.4 ± 14.7
4.7 ± 21.5
0.000
0.000
0.129
Postsurgery, 2 wk
10.5 ± 9.71
8.5 ± 9.313
5.2 ± 19.42
5.3 ± 12.423
Postsurgery, 6 wk
2.2 ± 10.8
2.4 ± 10.0
8.5 ± 15.6
6.5 ± 14.5
Postsurgery, 3 mo
6.3 ± 8.51
5.7 ± 4.91
1.8 ± 11.923
3.0 ± 9.913
Postsurgery, 6 mo
7.3 ± 3.81
−0.9 ± 3.72
8.5 ± 7.31
12.8 ± 10.71
Postsurgery, 1 yr
−9.3 ± 1.41
−9.5 ± 0.81
10.9 ± 2.22
−3.5 ± 3.63
Shoulder width stance (SWS), feet side-by-side stance (SSS), tandem stance with affected limb in the front (AFS), and tandem stance with nonaffected limb in the front (SFS). : interaction between factors; : main effect of time; : main effect of foot placement; ; . Superscript of alphabet: Tukey’s HSD post hoc analysis of simple main effect of foot placement factor. Superscript of number: Tukey’s HSD post hoc analysis of simple main effect of time factor.
