Is It Time to Phase Out the Austin Moore Hemiarthroplasty? A Propensity Score Matched Case Control Comparison versus Cemented Hemiarthroplasty
Table 1
Group characteristics and balance before and after PS matching.
Balance before and after PS matching
Before PS matching
After PS matching
Cemented
AMA
SMD
value
Cemented
AMA
SMD
value
146 cases
304 cases
128 cases
128 cases
Means
or (range, SD)
Means
or (range, SD)
Means
or (range, SD)
Means
or (range, SD)
Age
79.0
(36.9–98.2, 8.7)
84.4
(53.7–101, 7.1)
0.616
0.000
80.7
(62.6–98.2, 7.2)
81.0
(53.7–95.9, 7.1)
0.031
0.759
Age above 80
47.9%
70
74.7%
227
0.619
0.000
54.7%
70
56.3%
72
0.032
0.802
Males
28.8%
42
29.9%
91
0.026
0.799
27.3%
35
31.3%
40
0.086
0.492
Independent walker
52.1%
76
34.5%
105
0.349
0.000
46.9%
60
44.5%
57
0.047
0.707
Nonfunctional walker
4.8%
7
10.9%
33
0.283
0.034
5.5%
7
5.5%
7
0.000
1.000
Nursing home residence
13.0%
19
23.7%
72
0.316
0.008
14.1%
18
17.2%
22
0.093
0.491
Days delay in operation
2.1
(0–72, 6.0)
1.8
(0–44, 3.0)
0.057
0.426
2.1
(0–72, 6.4)
2.2
(0–44, 4.4)
0.008
0.946
3 days delay in operation or more
11.6%
17
9.5%
29
0.071
0.490
10.2%
13
12.5%
16
0.069
0.554
ASA score
2.5
(1–4, 0.6)
2.7
(1–4, 0.5)
0.331
0.001
2.5
(1–4, 0.6)
2.5
(1–4, 0.6)
0.000
1.000
ASA score 3 or above
46.6%
68
66.1%
201
0.411
0.000
49.2%
63
51.6%
66
0.046
0.708
Charlson Comorbidity Score
2.1
(0–13, 2.8)
2.6
(0–14, 2.6)
0.180
0.063
2.1
(0–13, 2.8)
2.0
(0–9, 2.2)
0.031
0.787
Charlson Comorbidity Score 5 or above
14.4%
21
21.1%
64
0.164
0.091
14.1%
18
13.3%
17
0.023
0.856
Length of clinical follow-up
17.0 m
(0–53.2, 11.8)
22.8 m
(0.1–55.3, 14.9)
0.000
16.7 m
(0–53.2, 11.6)
24.7 m
(0.4–55.3, 15.2)
0.000
at least 3 months
85.6%
125
81.3%
247
0.252
85.2%
109
82.0%
105
0.500
at least 9 months
65.8%
96
72.4%
220
0.151
64.8%
83
75.0%
96
0.076
Length of radiological follow-up
14.3 m
(0–53.2, 11.6)
17.2 m
(0–55.3, 14.0)
0.030
14.0 m
(0–53.2, 11.4)
19.0 m
(0–55.3, 15.0)
0.003
at least 3 months
77.4%
113
70.7%
215
0.136
76.6%
98
70.3%
90
0.258
at least 9 months
50.7%
74
56.3%
171
0.267
50.8%
65
59.4%
76
0.167
Pearson Chi square test for dichotomous variables. Two-tailed Independent sampled -test for continuous variables. (SMD) Standardized Mean Difference = difference in means ÷ Standard deviation.
