Comparison of the Femoral Prothesis-rotation in Conventional X-ray, in Axial CT Slices and 3D-reconstructed CT

Michael Tobias Hirschmann

Status: Completed

Conditions: Osteoarthritis

Treatments: Other: Kanekasu radiographs

Study type: Interventional

Funder types: Other

Identifiers

NCT02261038

332/13 (Other Identifier)

Rad-2CT-3CT_001_MH

Details and patient eligibility

About

Femoral component rotation in total knee arthroplasty (TKA) has been considered an important factor for outcome. However, measurement of femoral component rotation is difficult to perform.

Femoral TKA component rotation can be assessed on special radiographs (Kanekasu technique), axial CT slices and 3D reconstructed CT images.

It was the hypothesis that measurements on radiographs are comparable to measurement on CT images.

Measurements of femoral TKA rotation will be measured three times by three different observers and inter- and intraobserver reliability is calculated. The absolute values of each measurement method is noted in degrees.

Full description

Femoral component rotation in total knee arthroplasty (TKA) has been considered an important factor for outcome. However, measurement of femoral component rotation is difficult to perform.

Femoral TKA component rotation can be assessed on special radiographs (Kanekasu technique), axial CT slices and 3D reconstructed CT images.

It was the hypothesis that measurements on radiographs are comparable to measurement on CT images.

In agreement with our standard diagnostic algorithm for patients with pain and problems after TKA CT images as well as Kanekasu radiographs are performed. If the Kanekasu radiograph is comparable reliable, it could be possible to use this radiograph instead.

Measurements of femoral TKA rotation will be measured three times by three different observers and inter- and intraobserver reliability is calculated. The absolute values of each measurement method is noted in degrees. The measurements are performed with two weeks interval and the different observers are blinded to their previous and the measurements of the others.

The absolute difference of femoral TKA rotation is calculated between and inter the groups investigated.

Intra class correlation coefficients are calculated for inter- and intraobserver reliability.

Enrollment: 50 patients

Sex: All

Ages: 55 to 95 years old

Volunteers: No Healthy Volunteers

Inclusion criteria

• Total Knee prosthesis (primary)
• >55 years

Exclusion criteria

• pregnancy
• lactating women

Trial design

Primary purpose: Diagnostic

Allocation: N/A

Interventional model: Single Group Assignment

Masking: None (Open label)

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50 participants in 1 patient group

Kanekasu radiographs

Other group

Description:

No drugs or devices are used in this study. Commonly available radiological techniques such as radiographs and CT are used. All patients undergo a CT of the knee and a special radiograph (Kanekasu technique).

Treatment:

Other: Kanekasu radiographs