Page 18 - Delaware Medical Journal - November 2016
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TABLE II: Differences in Outcome Variables Over Time (Pre-Operative and 1 Year) and Between Group
OUTCOME MEASURE
SURGICAL APPROACH
PRE-LATERAL
POST-POSTERIOR
PRE-POSTERIOR
POST-POSTERIOR
Mean
SD
Mean
SD
Mean
SD
Mean
SD
Sx Hip Abd Strength (%BW)
14.3
8.7
12.9
7.2
14.7
7.8
17.0*§
5.9
NonSx Hip Abd Strength (%BW)
20.0
9.0
19.6
8.1
20.3
8.7
21.0
10.5
Sx Quad Strength (%BW)
70.6
32.2
92.2*
35.5
57.5
26.0
76.0*
32.4
NonSx Quad Strength (%BW)
89.7
34.9
97.1
35.0
77.6
32.9
82.9*
36.4
Timed Up and Go (sec)
9.5
6.8
6.6
1.5
9.6
3.9
7.9*
3.4
Stair Climbing Test (sec)
16.5
13.0
11.0
3.3
16.5
6.4
11.9*
3.0
6 Minute Walk (m)
476.4
136.2
602.9*
120.9
459.3
107.0
553.5*
115.8
Hip Outcome Score (%)
54.5
14.7
89.7*
9.2
60.5
17.0
90.0*
13.6
Sx Hip Pain (0-10)
5.5
2.3
0.6*
1.0
5.7
2.2
0.9*
2.0
NonSx Hip Pain (0-10)
0.9
1.4
0.6
1.5
0.8
1.8
0.8
1.6
TABLE II
* = a significant p value of p<0.05 that shows a significant change within a group between timepoints.
§ = a significant p value of p<0.05 that shows a significant difference between the two groups at a single timepoint. Sx = surgical side; NonSx = non-surgical side; %BW = percent body weight
data were pooled to evaluate main effect of time (Table III). When assessing pooled data, all functional variables improved between the pre-operative and one-year testing time points with the exception of knee strength on the non-surgical side, which decreased at the one-year time point and hip pain on the non- surgical side, which remained close to 0/10.
DISCUSSION
Results from this study partially support our hypothesis that individuals who underwent a posterior approach would have greater strength and functional recovery than individuals who underwent an anterolateral or lateral approach one year after surgery. Although the posterior group had stronger hip abduction
one year after, they did not demonstrate greater functional ability than the lateral group on any performance-based measure. As hypothesized, there were no differences between groups for
pain or self-reported outcome as both groups made substantial improvements by one year after surgery. Descriptive analysis revealed that the majority of pain and self-reported improvements were made three months after THA; whereas hip abductor
surgical approach on strength. While some have shown that lateral approaches result in less strength compared to the posterior approach after surgery,16 others have revealed no difference in strength outcomes after THA.17 The results of this study support the notion that the posterior approach allows for the restoration, or
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Del Med J | November 2016 | Vol. 88 | No. 11
