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Table 2 The categories for the revision hip replacement form (H2 form) and the revision knee replacement form (K2 form)

From: Validation of revision data for total hip and knee replacements undertaken at a high volume orthopaedic centre against data held on the National Joint Registry

Indication for revision—NJR categories for the revision hip replacement form (H2 form) Indication for revision—NJR categories for the revision knee replacement form (K2 form)
Adverse soft tissue reaction to particulate debris Aseptic loosening
Aseptic loosening Component dissociation
Dislocation/subluxation Dislocation/subluxation
Dissociation of the liner Implant fracture
Head-socket mismatch Infection
Implant fracture Instability
Infection Lysis
Lysis Malalignment
Malalignment Other
Other Peri-prosthetic fracture
Peri-prosthetic fracture Progressive arthritis to the remaining knee
Unexplained pain Stiffness
Wear of acetabular component Unexplained pain
  Wear of the polyethylene component