J Korean Knee Soc.  2010 Mar;22(1):56-63.

Comparison of the Limb Alignment and the Component Positioning between Conventional and Navigated Total Knee Arthroplasties for the Osteoarthritic Knees That Have Anatomic Variation

• Yang JH
• Lee HJ
• Oh KJ

Abstract

PURPOSE
The authors sought to assess the usefulness of navigation as opposed to the conventional method by analyzing the radiographic results obtained from subjects who underwent total knee arthroplasty for knees that were accompanied with anatomic variations.
MATERIALS AND METHODS
The study subjects were selected from 53 patients (a total 72 cases: 43 were treated by the conventional method and 29 were treated by the navigational method) who exhibited radiographic evidence of distal femoral varus (<0degrees) or proximal tibial varus (>2degrees). The coronal femoral component angle (alpha) and the coronal tibial component angle (beta) were measured, and the femoral component position in relation to the mechanical axis (theta) and the post-operative weight-bearing mechanical axis difference (MAD) were compared and analyzed.
RESULTS
The navigation method showed significant better results in terms of the alpha, theta and MAD (p<0.05). Among the outliers greater than 3degrees, a statistically significant difference was shown only for the MAD (p=0.030).
CONCLUSION
Navigation surgery is useful in terms of the femoral component's position in the coronal plane and limb alignment in the osteoarthritic knee that is accompanied by distal femoral varus or proximal tibial varus.

Keyword

Distal femoral varus; Proximal tibial varus; Navigation; Total knee arthroplasty

MeSH Terms

Adenine Nucleotides
Anatomic Variation
Arthroplasty
Axis, Cervical Vertebra
Extremities
Humans
Knee
Mycophenolic Acid
Weight-Bearing
Adenine Nucleotides
Mycophenolic Acid