Risk of cancer after primary total hip replacement: The influence of bearings, cementation and the material of the stem

Table 1.

Number of patients in sub-cohorts (bearing surface between head and cup, cementation, material of the stem) by age at operation

Group	Age group
Subgroup	0–40	40–49	50–59	60–69	70–79	≥ 80	Total
All	131	591	1,631	3,059	2,664	267	8,343
Bearing
MoM	12	43	141	124	18	0	338
MoP	39	233	763	2,128	2,481	265	5,909
CoC	69	274	535	407	38	0	1,323
CoP	11	41	192	400	127	2	773
Use of bone cement
Non-cemented	119	580	1,596	2,910	1,713	48	6,966
Cemented	12	11	35	149	951	219	1,377
Stem material
Ti-alloy	122	585	1,610	2,980	1,940	79	7,316
CoCr-alloy	9	5	21	67	586	162	850
Fe-alloy	0	1	0	12	138	26	177