Correlation Analysis between Navigation and Radiographic Measurement for Component Position of Total Knee Arthroplasty

Ho-Rim Choi; Jong-Seok Park; Dushin Jeong; Byung-Ill Lee

doi:10.4055/jkoa.2007.42.5.565

Journal List > J Korean Orthop Assoc > v.42(5) > 1012697

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Choi, Park, Jeong, and Lee: Correlation Analysis between Navigation and Radiographic Measurement for Component Position of Total Knee Arthroplasty

Original Article

Journal of the Korean Orthopaedic Association

Journal of the Korean Orthopaedic Association 2007; 42(5): 565-570.

Published online: 31 October 2007

DOI: https://doi.org/10.4055/jkoa.2007.42.5.565

Correlation Analysis between Navigation and Radiographic Measurement for Component Position of Total Knee Arthroplasty

Ho-Rim Choi, M.D., Jong-Seok Park, M.D., Dushin Jeong, M.D., MPH^*, Byung-Ill Lee, M.D.

Department of Orthopaedic Surgery, College of Medicine, SoonChunHyang University, Cheonan, Korea.

^*Department of Neurology and Clinical Epidemiology, College of Medicine, SoonChunHyang University, Cheonan, Korea.

Address reprint requests to Ho-Rim Choi, M.D. Department of Orthopaedic Surgery, SoonChunHyang University Hospital, 23-20, Bongmyeong-dong, Cheonan 330-721, Korea. Tel: +82.41-570-3641, Fax: +82.41-572-7234, chros@schch.co.kr

Abstract

Purpose

To examine the correlation between the Navigation and radiographic measurements for the postoperative mechanical axis and component position in total knee arthroplasty.

Materials and Methods

From December 2005 to May 2006, Navigation assisted MIS TKA was performed on 46 knees of 34 patients. After fixing the components, the mechanical axis (MA) of the lower extremity, femoral component position to the mechanical axis in the coronal plane (θ), tibial component position in the coronal (β) and sagittal (δ) planes was measured using the Navigation. Two observers measured the same angles using the postoperative follow-up radiographs. The measurements were compared and the correlation between the Navigation and radiographic measurement was analyzed.

Results

The average Navigation measurements were valgus 0.02±1.09° for MA, varus 0.05±0.96° for θ, valgus 0.02±0.86° for β and 4.03±1.25° for δ. The mean radiographic measurements of observer 1 were valgus 0.71±3.73° for MA, valgus 1.14±1.72° for θ, valgus 0.90±1.47° for β and 4.51±2.03° for δ. Those of observer 2 were valgus 0.12±3.39°, valgus 0.16±1.96°, valgus 0.30±1.65° and 3.85±1.60°, respectively.

Conclusion

The average of measurement for the component position showed a statistically significant difference in the MA (p=0.001), θ (p=0.000) and β (p=0.000) among three groups. There were a relatively high correlation between observer 1 and 2 for the radiographic measurements (r=0.67-0.96). However there was a very low correlation between the Navigation and radiographic measurements (r=0.10-0.39). Therefore, the possibility of a difference between the Navigation and radiographic measurement need to be considered when evaluating the component position.

Keywords: Total Knee Arthroplasty, Navigation, Radiographic measurement, Component position, Correlation analysis

Figures and Tables

Fig. 1

A mechanical axis (MA) was formed between the mechanical axis of the femur and the tibia.

Fig. 2

The θ angle is the coronal femoral component angle against the femoral mechanical axis. The β angle is the coronal tibial component angle against the tibial mechanical axis.

Fig. 3

The δ angle was formed between the mechanical axis of the tibia and the line of the tibial plate in the sagittal plane (posterior slope).

Table 1

Measured Angle of the Component and Mechanical Axis (mean±SD, degree)

MA, Mechanical axis; θ, Femoral component angle between the femoral mechanical axis and the femoral component; β, Tibial component angle between the tibial mechanical axis and the tibial component (+: valgus, -: varus); δ, Posterior slope of tibial component against sagittal tibial mechanical axis (+: posterior slope, -: anterior slope).

Table 2

Pearson Correlation Coefficient of the Navigation and Two Observers

^*, p<0.05; ^†, p<0.01.

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