Display Settings:


Send to:

Choose Destination
See comment in PubMed Commons below
Biomed Tech (Berl). 2012 Apr 10;57(4):277-82. doi: 10.1515/bmt-2011-0093.

Component sizing in total knee arthroplasty: patient-specific guides vs. computer-assisted navigation.

Author information

  • 1Department of Orthopedic Surgery, Feinberg School of Medicine, Northwestern University, Chicago, IL 60611, USA.



Patient-specific guides (PSG) and computer-assisted navigation (CAN) are technologies that have been developed to improve the accuracy and reproducibility of total knee arthroplasty (TKA). The purpose of this study is to compare the methodology by which a PSG system and an intraoperative navigation system (CAN) perform an anatomical registration and correctly predict femoral component size in TKA.


One hundred and eleven PSG TKA were performed, 30 of which were concurrently evaluated with CAN. PSG-predicted and CAN-predicted femoral component size were compared with the actual component selection. The process by which PSG and CAN determines component sizing was evaluated.


The PSG system was both more accurate and more precise than the CAN navigation system in predicting femoral component size in TKA.


In this study, the surgeon's final component selection was more likely to be in accordance with the PSG rather than the CAN sizing algorithm. This study suggests that intraoperative surface registration may not be as accurate as preoperative three-dimensional magnetic resonance imaging reconstructions for establishing optimal femoral component sizing.

[PubMed - indexed for MEDLINE]
PubMed Commons home

PubMed Commons

How to join PubMed Commons

    Supplemental Content

    Icon for iFactory
    Loading ...
    Write to the Help Desk