Muscular strength after total hip arthroplasty

Figures & data

Table 1. Preoperative characteristics of patients in the direct lateral approach (DLA), posterior approach (PA), and anterior approach (AA) groups. Values are mean (SD) or mean (range)

	DLA	PA	AA	p-value
Age, years	57 (45–68)	56 (44–67)	56 (30–69)	0.8
Sex, F/M	13/8	8/11	15/5	0.1
BMI	26 (2.6)	27 (3.7)	26 (3.4)	0.7
Abduction, kg	12 (4.6)	12 (5.3)	11 (3.1)	0.4
Leg press, kg	75 (23)	91 (25)	72 (26.3)	0.04

Figure 4. Pain scores (numeric rating scale) in the direct lateral approach (DLA) group, the posterior approach (PA) group, and the anterior approach (AA) group pre- and postoperatively. The circles are outliers. These are defined as values that do not fall within the inner fences. The asterisks are extreme outliers. These represent cases or rows that have values more than 3 times the height of the boxes.

Table 2. Results from the leg-press test. Leg press (% compared with preoperative value)

	Group			Group difference		Group difference		Group difference
Follow-up	DLA	PA	AA	DLA−PA	p-value	DLA−AA	p-value	PA−AA	p-value
2 days	49	76	80	−27	0.003	−31	0.001	−4	1.0
8 days	63	95	89	−32	< 0.001	−26	0.001	6	1.0
6 weeks	91	117	99	−26	0.005	−8	0.8	18	0.09
3 months	112	131	113	−19	0.09	−1	1.0	18	1.0

Values of p are presented with Bonferroni adjustments.

Figure 5. Postoperative leg-press strength compared with preoperative values (100%) in the direct lateral approach (DLA) group, the posterior approach (PA) group, and the anterior approach (AA) group. #, Δ , and □ show statistically significant differences in percent change relative to preoperative values between groups.

Table 3. Results from the abduction test. Abduction (% compared with preoperative value)

	Group			Group difference		Group difference		Group difference
Follow-up	DLA	PA	AA	DLA−PA	p-value	DLA−AA	p-value	PA−AA	p-value
2 days	57	87	80	−30	0.003	−23	0.03	7	1.0
8 days	69	107	94	−38	0.001	−25	0.02	13	0.8
6 weeks	100	139	107	−39	0.001	−7	1.0	32	0.02
3 months	127	153	129	-26	0.09	-2	1.0	24	0.09

Values of p are presented with Bonferroni adjustments.

Figure 6. Postoperative abduction strength compared with preoperative values (100%) in the direct lateral approach (DLA) group, the posterior approach (PA) group, and the anterior approach (AA) group. #, Δ , and □ , see Figure 5