Quantification of structural changes of UHMWPE components in total joint replacements

Table 3 Results of IR and ESR measurements of explanted UHMWPE components

Sample	Location of sample	Years in vivo	Oxidation indices, various sites			VI range	FRC (mol/g)
			OI inner	OI middle	OI outer
L1	Unworn	11	1.79	0.08	0.85	0.010–0.016	1.4e-10
	Worn	11	2.37	0.09	0.98	0.010–0.016	1.4e-10
L2	Unworn	20	0.43	0.19	0.28	0.014–0.020	5.0e-10
	Worn	20	1.52	0.22	0.89	0.014–0.020	5.0e-10
L3	Unworn	16	0.64	0.06	0.34	0.008–0.012	1.4e-10
	Worn	16	1.55	0.06	0.49	0.008–0.012	1.4e-10
L4	Unworn	10	6.62	1.35	2.50	0.012–0.018	5.2e-10
	Worn	10	2.14	1.52	2.34	0.012–0.018	5.2e-10

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