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

Completed

• Conditions: Knee Osteoarthritis

• Registration Number: NCT05277883
• Lead Sponsor: Valdoltra Orthopedic Hospital

Brief Summary

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

Detailed Description

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 Timeline

• Study First Submitted: 2022-03-03
• Study First Submitted QC: 2022-03-03
• Study First Posted: 2022-03-14
• Study Start: 2022-12-01
• Status Verified: 2024-12
• Primary Completion: 2024-12-25
• Study Completion: 2024-12-25
• Last Update Submitted: 2025-03-25
• Last Update Posted: 2025-03-30

Recruitment & Eligibility

• Status: COMPLETED
• Sex: All
• Target Recruitment: 112

Inclusion Criteria

Knee osteoarthritis scheduled for knee arthroplasty

Exclusion Criteria

• previous leg deformities or surgery that changes alignment

Study & Design

• Study Type: OBSERVATIONAL
• Study Design: Not specified

Primary Outcome Measures

Name	Time	Method
The angle difference between an x-ray and a CT scan	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.

Trial Locations

Locations (1)

Orthopaedic Hospital Valdoltra; 🇸🇮 Ankaran, Slovenia