J Korean Knee Soc.  2009 Mar;21(1):15-21.

A Comparison of Accuracy between the Sonography-guided Extramedullary and Intramedullary Alignment Systems for the Femoral Component in Total Knee Arthroplasty

• Lee S
• Kim J
• Kim JH
• Yang SJ
• Ryu CW

Abstract

PURPOSE
We wanted to compare the accuracy between a newly suggested sonography-guided extramedullary alignment guide system and an ordinary intramedullary alignment guide system for the femoral component alignment in Total Knee Arthroplasty (TKA).
MATERIALS AND METHODS
Among the patients who underwent TKA from December 2006 to May 2007, an intramedullary technique was applied in 50 cases (the IM group) and an extramedullary technique was used in 50 cases (the EM group). The femoral component alignment angle was measured and compared postoperatively by using an anteroposterior (AP) radiograph of the knee.
RESULTS
The average femoral component alignment angle was 94.96degrees (92~98degrees) in the IM group and 95.36degrees (90~99degrees) in the EM group. Both groups didn't show a significant difference. 45 cases (90%) in the IM group and 43 cases (86%) in the EM group were included in the optimal range of the femoral coronal angle (95degrees+/-2).
CONCLUSION
There was no significant difference regarding the accuracy of the sonography-guided extramedullary and intramedullary femoral component alignment guide systems for performing Total Knee Arthroplasty.

Keyword

Total Knee Arthroplasty; Sonography-guided extramedullary alignment guide; Intramedullary alignment guide

MeSH Terms

Arthroplasty
Humans
Knee