Clinical Orthopaedics and Related Research

, Volume 466, Issue 11, pp 2736–2744 | Cite as

Radiographic and Navigation Measurements of TKA Limb Alignment Do Not Correlate

  • Mark A. Yaffe
  • Samuel S. Koo
  • S. David StulbergEmail author
Symposium: Papers Presented at the Annual Meetings of the Knee Society


Precise pre- and postoperative anatomic measurements are necessary to plan, perform, and evaluate total knee arthroplasty (TKA). We evaluated the relationship between radiographic and navigation alignment measurements, identified sources of error in radiographic and navigated alignment assessment, and determined the differences between desired and clinically accepted alignment. Fifty-eight computer-assisted TKAs were performed and limb alignment measurements were recorded both pre- and postoperatively with standard radiographs and with an intraoperative navigation system. Intraoperative navigation produced consistent navigation-generated alignment results that were within 1° of the desired alignment. The difference between preoperative radiographic and navigation measurements varied by as much as 12° and the difference between postoperative radiographic and navigation measurements varied by as much as 8°. This discrepancy depended on the degree of limb deformity. Postoperative radiographic measurements have inherent limitations. Navigation can generate precise, accurate, and reproducible alignment measurements. This technology can function as an effective tool for assessing pre- and postoperative limb alignment and relating intraoperative alignment measurements to clinical and functional outcomes.

Level of Evidence: Level II, therapeutic study. See the Guidelines for Authors for a complete description of levels of evidence.


Total Knee Arthroplasty Navigation System Mechanical Axis Tibial Slope Radiographic Measurement 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



We thank Joseph Feinglass, PhD, Steven Gondek, MD, and Emily Martin, MD, for their valued contributions to this study.


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Copyright information

© The Association of Bone and Joint Surgeons 2008

Authors and Affiliations

  • Mark A. Yaffe
    • 1
  • Samuel S. Koo
    • 1
  • S. David Stulberg
    • 1
    • 2
    Email author
  1. 1.Feinberg School of MedicineNorthwestern UniversityChicagoUSA
  2. 2.Joint Reconstruction & Implant ServiceNorthwestern Memorial HospitalChicagoUSA

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