TABLE IV.

Regional and Total Surface Damage Scores for the Retrieved Tibial Inserts Classified According to Processing Conditions (Sterilization Procedure, Consolidation Method, and Polyethylene Resin Type)^*

Processing Conditions	Condylar Damage Score	Backside Damage Score	Post Damage Score†	Total Surface Damage Score
Gamma-air, direct compression molded, 1900H	48 ± 27	17 ± 8	NA	56 ± 36
Gamma-air, extruded, GUR 4150	48 ± 18	14 ± 7	19 ± 7	69 ± 24
Gamma-air, molded, GUR 1050	49 ± 27	20 ± 11	15 ± 9	84 ± 46
Gamma-inert, molded, 1900H	23 ± 7	10 ± 9	14 ± 8	47 ± 2
Gamma-inert, direct compression molded, 1900H	35 ± 19	10 ± 6	12 ± 7	54 ± 27
Gamma-inert, molded, GUR 1050	37 ± 11	16 ± 7	14 ± 8	64 ± 22
Gamma-inert, molded, GUR 1020	31 ± 10	8 ± 5	9 ± 4	45 ± 16

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

^†NA = Not applicable (nonmodular designs, direct compression-molded onto metal backing, cruciate-retaining designs).