Packaging error -- two different types and sizes of acetabular liners used during hip replacement surgery were mistakenly packaged into each other's outer boxes after sterilization, resulting in the products being mislabeled. The units labeled as Model/Catalog Number 931-28-248 Lot/Serial Number 685F1034 on the outside and containing Model/Catalog Number 932-36-252, Lot# 728F1089 on the inside (1