Mid-term progressive loosening of hydroxyapatite-coated femoral stems paired with a metal-on-metal bearing

Table 3 Statistically significant correlations between clinical, radiographic, and retrieval variables for all bearing groups

Variable	Variable 2	R	p value
Implantation period	HA coating removal (proximal)	0.643	< 0.001
	HA coating removal (distal)	0.597	< 0.001
	Goldberg score	0.529	< 0.001
	Radiolucency (proximal)	0.359	0.034
	Radiolucency (distal)	0.351	0.039
HA removal (proximal)	HA Removal (distal)	0.539	< 0.001
HA removal (proximal)	Goldberg score	0.586	< 0.001
Goldberg score	Radiolucent lines (proximal)	0.357	0.048

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