TABLE II.

Shelf Lives (Prior to Implantation) and Implantation Times for the Historical and Conventional Knee Retrievals Classified According to Resin and Processing Route

Processing Conditions	N	Shelf Life*(yr)	In Vivo Time*(yr)
Gamma-air, direct compression molded, 1900H	4	0.7 ± 0.3	13.5 ± 0.7
Gamma-air, extruded, GUR 4150	19	1.2 ± 1.5	10.9 ± 3.3
Gamma-air, molded, GUR 1050	3	1.2 ± 1.4	8.7 ± 2.8
Gamma-inert, molded, 1900H	3	0.6 ± 0.2	4.5 ± 2.9
Gamma-inert, direct compression molded, 1900H	34	1.3 ± 1.8	3.4 ± 2.3
Gamma-inert, molded, GUR 1050	32	1.4 ± 1.5	3.0 ± 2.2
Gamma-inert, molded, GUR 1020	28	0.7 ± 0.8	1.7 ± 1.4

^*The values are given as the average and the standard deviation.