Accuracy of the short radiograph in the measurement of the tibiofemoral angle

Y. Ishii, G. Ohmori, Joan E Bechtold, RE E. Sherman, RB B. Gustilo

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

To determine which axes on the 'short' radiograph (36 cm × 43 cm) correlate best with the corresponding axes on the 'long' radiograph (36 cm × 130 cm), 100 long anteroposterior radiographs were taken postoperatively following total knee arthroplasty. The central 43 cm of the long radiograph were used to simulate a short radiograph of the knee. For the femur, the short-radiograph axis drawn from the midpoint at the proximal end to a point 10 cm above the joint line had the highest coefficient of correlation (r = 0.97) with the anatomical axis of the femur on the long radiograph. For the tibia, the short-radiograph axis drawn from the midpoint of the distal end of the tibia to a point 10 cm below the joint line had the best correlation (r = 0.93) with the anatomical axis of the tibia on the long radiograph. The tibiofemoral angle created by these two axes was 5.3°, which, in comparison to eight other axis combinations tested on the short radiographs, correlated best (r = 0.94) with the mean tibiofemoral angle observed on the long radiographs. We find this angle to be a satisfactory indication of the tibiofemoral angle on a long radiograph. This finding will allow a more accurate determination of the optimal tibiofemoral angle that is so important to the long-term success of total knee arthroplasty.

Original languageEnglish (US)
Pages (from-to)81-84
Number of pages4
JournalThe Knee
Volume2
Issue number2
DOIs
StatePublished - Jun 1995

Keywords

  • Tibiofemoral angle
  • radiography

Fingerprint Dive into the research topics of 'Accuracy of the short radiograph in the measurement of the tibiofemoral angle'. Together they form a unique fingerprint.

Cite this