Satisfactory clinical and radiologic outcomes with a new shorter and modular stem for end-stage hip osteoarthritis: an international prospective multicentre pilot study

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Table 4

Subgroup analysis by age; difference between time point was performed with Bonferroni adjusted p-value.

Follow up visit	Mean value and comparison within time period
	<60 yrs	≥60 yrs
	Unadjusted mean ± SD (n)	Unadjusted mean ± SD (n)	p-value
UCLA
Preop	3.8 ± 1.6 (84)	3.9 ± 1.6 (138)	0.7022
6 Month	5.7 ± 1.4^a (70)	5.4 ± 1.4^a (125)	0.1219
1 Year	6.5 ± 1.3^a,b (68)	5.5 ± 1.6^a (110)	<.0001*
2 Year	6.7 ± 1.3^a,b (58)	5.6 ± 1.6^a (87)	<.0001*
3 Year	6.8 ± 1.4^a,b (59)	5.8 ± 1.6^a (84)	<.0001*
5 Year	6.8 ± 1.2^a (33)	6.2 ± 1.5^a (42)	0.0724
EQ5D
Preop	0.4 ± 0.3 (84)	0.5 ± 0.3 (138)	0.0525
6 Month	0.9 ± 0.2^a (71)	0.9 ± 0.1^a (122)	0.8100
1 Year	0.9 ± 0.2^a,b (67)	0.9 ± 0.2^a (109)	0.3107
2 Year	0.9 ± 0.2^a,b (58)	0.9 ± 0.2^a (86)	0.8005
3 Year	0.9 ± 0.1^a,b (59)	0.9 ± 0.2^a (84)	0.1067
5 Year	1.0 ± 0.1^a,b (30)	0.9 ± 0.1^a,b (43)	0.2594
HHS
Preop	48.6 ± 12.1 (84)	46.4 ± 13.3 (138)	0.4109
6 Month	94.2 ± 8.7^a (70)	91.3 ± 9.0^a (124)	0.4148
1 Year	97.5 ± 4.5^a,b (68)	94.4 ± 7.6^a,b (109)	0.0588
2 Year	97.5 ± 4.1^a,b (58)	95.6 ± 8.5^a,b (86)	0.1517
3 Year	98.4 ± 5.0^a,b (59)	97.3 ± 8.2^a,b (83)	0.0383*
5 Year	98.7 ± 2.4^a,b (30)	96.9 ± 5.6^a,b (43)	0.0842
Oxford
Preop	21.6 ± 7.7 (84)	22.3 ± 7.6 (138)	0.3280
6 Month	43.5 ± 5.8^a (71)	43.3 ± 5.3^a (124)	0.2798
1 Year	46.1 ± 3.1^a,b (68)	44.0 ± 5.5^a (110)	0.0057*
2 Year	46.2 ± 2.6^a,b (58)	44.7 ± 5.0^a,b (87)	0.1743
3 Year	46.7 ± 2.8^a,b (59)	45.2 ± 4.6^a,b (83)	0.0114*
5 Year	47.1 ± 1.5^a,b (33)	45.9 ± 3.2^a,b (43)	0.0524
Aluminum (μg/L)
Preop	12.1 ± 2.5 (11)	12.1 ± 1.4 (20)	0.2648
6 Month	12.3 ± 2.0 (13)	12.0 ± 1.5 (12)	0.7234
1 Year	14.0 ± 2.9 (13)	14.4 ± 4.5 (11)	0.8846
2 Year	15.1 ± 4.4 (12)	12.0 ± 1.0 (9)	0.1019
5 Year	13.5 ± 3.0 (3)	14.6 ± 2.3 (4)	0.4795
Titanium (μg/L)
Preop	2.4 ± 0.5 (7)	1.2 ± 0.2 (2)	0.0404*
6 Month	2.4 ± 1.4 (19)	2.4 ± 2.0 (24)	0.4123
1 Year	2.6 ± 1.6 (17)	2.4 ± 2.0 (18)	0.4976
2 Year	3.3 ± 3.3 (14)	2.4 ± 0.8 (13)	0.7891
5 Year	1.4 ± 0.4 (2)	1.2 ± 0.2 (3)	0.5637

Scores and laboratory findings are presented as mean ± SD (n).

Significant difference (p < 0.05) by time; – = not evaluated.

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