Table 1

Classification of types and reasons for unplanned secondary procedures

Specific unplanned secondary procedures include	Classification of the reason for secondary procedures is as follows
Closed reduction of hip dislocation Open reduction of hip dislocation Open reduction of fracture Soft tissue procedure Insertion of antibiotic spacer Full implant exchange Partial implant exchange—stem only Partial implant exchange—head only Partial implant exchange—liner only Partial implant exchange—head and liner Partial implant exchange—acetabular component only Partial implant exchange—acetabular component and head Implant adjustment—re-orientation of the stem Implant adjustment—re-orientation of the acetabulum component Implant removal with no replacement Excision heterotopic ossification Supplementary fixation	Treat a periprosthetic fracture Treat hip instability or dislocation Treat infection—superficial Treat infection—deep Treat wound necrosis Treat another wound healing problem Remove heterotopic ossification Manage abductor failure Manage another soft tissue problem (ie, pseudotumour) Correct implant failure—loosening or subsidence Correct implant failure—breakage Treat implant wear Treat osteolysis Treat implant corrosion Improve function Relieve pain

Specific unplanned secondary procedures include

Classification of the reason for secondary procedures is as follows