Influence of Knee Alignment and Pelvis Rotation on Accuracy of Radiograph Measurements Before Total Knee Arthroplasty

Valdoltra Orthopedic Hospital112 enrolled

Overview

The aim of this study is to determine the accuracy of long leg standing X-rays with respect to coronal alignment of the knee.

Long leg standing x-ray is a routine examination to measure the femoral valgus angle before a total knee arthroplasty. Newer studies have shown that coronal leg alignment influences the rotation of the distal femoral part. This rotation might influence the measurements obtained with a long leg standing x-ray. The primary purpose of this study is to determine whether there is a significant difference between 2D measurements taken on the x-ray and 3D measurements obtained with a CT scan.

Study Type

OBSERVATIONAL

Enrollment

112

Conditions

Knee Osteoarthritis

Interventions

CT scanRADIATION

CT of the lower limb

Eligibility

Sex: ALLMin age: 50 Years

Medical Language ↔ Plain English

Inclusion Criteria: Knee osteoarthritis scheduled for knee arthroplasty Exclusion Criteria: * previous leg deformities or surgery that changes alignment

Locations (1)

Orthopaedic Hospital Valdoltra

Ankaran, Slovenia, Slovenia

Outcomes

Primary Outcomes

The angle difference between an x-ray and a CT scan

The femoral valgus angle, femoral mechanical angle, tibial mechanical angle and hip knee ankle angle are measured separately on the x-ray and on the CT scan. The difference in individual angle is the calculated.

Time frame: Before surgery

Data from ClinicalTrials.gov

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