Table 1.

Demographic and clinical data on all patients who received a THA in the period 2007–2014 in the Netherlands (n = 161,360)

	Non-mixed THA (n = 142,964)		Mixed stem- head THA (n = 3,663)		Mixed head- cup THA (n = 12,960)		Mixed stem- head-cup THA (n = 1,773)		Total (n = 161,360)
	n	(%)	n	(%)	n	(%)	n	(%)	n	(%)
Age, years
< 60	26,586	19	502	14	3,078	24	280	16	30,446	19a
60–74	75,156	53	1,743	48	6,436	50	875	50	84,210	52
≥ 75	40,891	29	1,412	39	3,421	26	611	35	46,335	29
Sex
Male	46,656	33	1,093	30	4,147	32	583	33	52,479	33a
Female	95,491	67	2,554	70	8,755	68	1,180	67	107,980	67
ASA score
I	33,483	25	947	26	3,508	29	383	25	38,321	25a
II	85,068	63	1,973	55	6,846	57	977	64	94,864	62
III–IV	16,745	12	´686	19	1,772	15	161	11	19,364	13
Diagnosis
Osteoarthritis	124,464	87	3,191	87	10,568	82	1,545	87	139,768	87a
Non-osteoarthritis	18,500	13	472	13	2,392	18	228	13	21,592	13
Previous operation
No	127,244	94	3,225	90	10,815	87	1,559	94	142,843	93a
Yes	6,599	4.9	277	7.7	1,087	8.8	88	5.3	8,051	5.3
Unknown	1,605	1.2	90	2.5	497	4.0	4	0.2	2,195	1.4
Fixation
Cementless	92,150	65	747	20.5	4,135	33	1,464	91	98,496	62a
Hybrid	3,519	2.5	272	7.5	3,538	28	19	1.2	7,348	4.6
Cemented	41,878	30	2,515	69	2,390	19	75	4.7	46,858	29
Reversed hybrid	3,898	2.8	106	2.9	2,589	20	43	2.7	6,636	4.2
Unknown	125	0.1	23	0.6	37	0.3	0	0.0	164	0.1
Diameter of head
22–28 mm	53,543	38	2,806	77	7,523	58	509	29	64,381	40a
32 mm	59,911	42	293	8.0	4,011	31	1,193	67	65,408	41
36 mm	26,302	18	232	6.3	1,343	10	35	2.0	27,912	17
≥ 38 mm	3,207	2.2	323	8.8	83	0.6	36	2.0	3,649	2.3
Articulation
Metal-on-metal	6,411	4.5	87	2.4	16	0.1	0	0.0	6,514	4.0a
Metal-on-PE	48,107	34	1,957	54	3,672	28	134	7.7	53,870	33
Ceramic-on-PE	66,704	47	1,245	34	7,417	57	1,551	89	76,917	48
Ceramic-on-ceramic	11,962	8.5	349	9.6	1,275	9.9	52	3.0	13,638	8.5
Other	7,913	5.6	12	3.3	447	3.5	3	0.2	8,375	5.2
Period
2007–2009	35,241	24	939	26	4,256	33	923	52	41,359	26a
2010–2011	37,907	27	1,452	40	3,814	29	748	42	43,921	27
2012–2014	69,816	49	1,272	35	4,890	38	102	5.8	76,080	47

^ap < 0.0001.

Numbers do not add up to total due to unknown or missing components.