Computer-assisted knee arthroplasty versus a conventional jig-based technique. A randomised, prospective trial

J Bone Joint Surg Br. 2004 Apr;86(3):372-7. doi: 10.1302/0301-620x.86b3.14643.


We have compared a new technique of computer-assisted knee arthroplasty with the current conventional jig-based technique in 70 patients randomly allocated to receive either of the methods. Post-operative CT was performed according to the Perth CT Knee Arthroplasty protocol and pre- and post-operative Maquet views of the limb were taken. Intra-operative and peri-operative morbidity data were collected and blood loss measured. Post-operative CT showed a significant improvement in the alignment of the components using computer-assisted surgery in regard to femoral varus/valgus (p = 0.032), femoral rotation (p = 0.001), tibial varus/valgus (p = 0.047) tibial posterior slope (p = 0.0001), tibial rotation (p = 0.011) and femorotibial mismatch (p = 0.037). Standing alignment was also improved (p = 0.004) and blood loss was less (p = 0.0001). Computer-assisted surgery took longer with a mean increase of 13 minutes (p = 0.0001).

Publication types

  • Clinical Trial
  • Comparative Study
  • Randomized Controlled Trial

MeSH terms

  • Arthroplasty, Replacement, Knee / methods*
  • Bone Malalignment / surgery
  • Femur / surgery
  • Humans
  • Postoperative Care / methods
  • Postoperative Complications / etiology
  • Prospective Studies
  • Rotation
  • Surgery, Computer-Assisted / methods*
  • Tibia / surgery
  • Time Factors
  • Tomography, X-Ray Computed / methods