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Knee Surgery, Sports Traumatology, Arthroscopy

Published in:

01-12-2011 | Knee

The anterior trochlear line as a reference for femoral component positioning in total knee arthroplasty

Authors: Kazuki Morizane, Toshiaki Takahashi, Fumihiko Konishi, Haruyasu Yamamoto

Published in: Knee Surgery, Sports Traumatology, Arthroscopy | Issue 12/2011

Abstract

Purpose

A new radiographic method using the anterior and posterior femoral condyles as a landmark to determine the rotational alignment of the femoral component in TKA had been developed.

Methods

The new radiograph presents an axial view of the distal femur. The patients were asked to lie in the supine position and flex the knee approximately 120° to 130°. Radiographs were applied at an inclination angle of 20° to 30°. The condylar twist angle (CTA), the external rotational angle between the posterior condylar (PC) line and the clinical transepicondylar axis (TEA), and the trochlear line angle (TLA), and the internal rotational angle between the anterior trochlear line and the clinical TEA were measured. Images were taken of 129 knees in 87 patients with osteoarthritis of the knee. The measurement values obtained using our method with those obtained using 3D reconstructed images from a 3-dimensional helical CT system (n = 35) were compared.

Results

The average CTA was 5.7° ± 2.8° and the average TLA was −5.6° ± 3.2°. The CTA was negatively correlated with the tibiofemoral angle (TFA). The average TLA was positively correlated with the TFA. The average difference between the TLA values obtained with this view and those obtained using the 3D-CT was 0.5° ± 1.6°. The relationship between the radiograph and 3D-CT in TLA was higher than that in CTA.

Conclusions

This radiographic technique allows easy and simultaneous measurement of the CTA and TLA and may provide an alternative method for assessing the TEA of the femur during preoperative planning for TKA.

Level of evidence

II.

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Title: The anterior trochlear line as a reference for femoral component positioning in total knee arthroplasty
Authors: Kazuki Morizane
Toshiaki Takahashi
Fumihiko Konishi
Haruyasu Yamamoto
Publication date: 01-12-2011
Publisher: Springer-Verlag
Published in: Knee Surgery, Sports Traumatology, Arthroscopy / Issue 12/2011
Print ISSN: 0942-2056
Electronic ISSN: 1433-7347
DOI: https://doi.org/10.1007/s00167-011-1401-8

At a glance: The ONWARDS insulin icodec trials

Springer Medicine

The anterior trochlear line as a reference for femoral component positioning in total knee arthroplasty

Abstract

Purpose

Methods

Results

Conclusions

Level of evidence

At a glance: The ONWARDS insulin icodec trials

Springer Medicine

Abstract

Purpose

Methods

Results

Conclusions

Level of evidence

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