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

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

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Key information

Conditions

Knee Osteoarthritis Arthritis Joint Diseases Musculoskeletal Diseases Osteoarthritis Osteoarthritis, Knee Rheumatic Diseases

Age range

50 year and older

Sex eligibility

All sexes

Study type

Observational

Primary location

Orthopaedic Hospital Valdoltra

Ankaran, Slovenia, 6820

About this study

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.

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

Knee osteoarthritis scheduled for knee arthroplasty

Exclusion criteria

previous leg deformities or surgery that changes alignment

Treatment and study plan

CT Scan

Radiation

CT of the lower limb

Primary outcomes

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

Time frame: Before surgery

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.

Sponsors and collaborators

Lead sponsor

Valdoltra Orthopedic Hospital

Other

Registry information

Official study title

The Influence of Lower Extremity and Pelvic Alignment on Accuracy of Hip-Knee-Ankle Radiograph Measurements Before Total Knee Arthroplasty

Important dates

Study start: 2022
Primary completion: 2024
Study completion: 2024
First posted: Mar 14, 2022
Registry last updated: Mar 30, 2025

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

Published trials that share one or more normalized conditions with this study.

Completed