Table 4.

Summarized data on the weighted means of the mechanical complications rates reported by the individual studies, according to the presence of a metallic core

Group §	Number of spacers	Mechanical complications, % ± SD	Spacer fracture, % ± SD	Perispacer fracture, % ± SD	Spacer dislocation, % ± SD	Acetabular complications, % ± SD
Metallic core	1308	18.2 ± 18.6	2.8 ± 6.1	3.1 ± 6.8	11.3 ± 7.8	1 ± 4.2
No metallic core	220	23.2 ± 17.6	4.5 ± 4.7	6.8 ± 6.5	9.1 ± 7.5	2.7 ± 6.3
p value	–	0.477	0.446	0.155	0.457	0.348

SD standard deviation

^§Data available for 39 out of 40 studies