Survival outcomes of cemented compared to uncemented stems in primary total hip replacement

Table 1 Thirteen year New Zealand Joint Registry results for revision rates vs fixation method

Fixation	Component years	Events	Rate/100 cy	95%CI
Cemented	149098	870	0.58	0.55-0.62
Hybrid	168604	117	0.66	0.62-0.70
Reverse hybrid	3124	19	0.61	0.37-0.95
Uncemented	148214	1313	0.89	0.84-0.94

Table 2 Thirteen year New Zealand Joint Registry reasons for revision for loosening within 90 d n (%)

Fixation/n	Loose cup	Loose stem	Unstable	Deep infection	Pain	Femoral fracture
Cemented/77	6 (7.8)	3 (3.9)	58 (75.3)	9 (11.7)	9 (2.6)	3 (3.9)
Hybrid/189	31 (16.4)	7 (3.7)	113 (59.8)	26 (13.8)	5 (2.6)	9 (4.8)
Reverse hybrid/2	0	1 (50)	0	0	0	1 (50)
Uncemented/270	23 (8.5)	23 (8.5)	108 (40)	26 (9.6)	5 (1.9)	81 (30)

Table 3 Thirteen year New Zealand Joint Registry reasons for revision for loosening by fixation method n (%)

Fixation/n	Loose cup	Loosestem	Unstable	Deep infection	Pain	Femoral fracture
Cemented/870	415 (48)	148 (17)	200 (23)	105 (12)	86 (10)	74 (8.50)
Hybrid/1117	160 (14)	235 (21)	384 (34)	157 (14)	136 (12)	141 (11)
Reverse Hybrid/19	4 (21)	1 (5)	5 (26)	4 (21)	2 (11)	3 (16)
Uncement- ed/1313	198 (15)	192 (15)	307 (24)	124 (9)	222 (17)	141 (11)
P value	< 0.001	< 0.001	< 0.001	0.003	< 0.001	0.208