Validity, Reliability and Reproducibility of Plain Radiographic Measurements After Total Hip Arthroplasty

March 29, 2014 updated by: Lennart Bråbäck, Sundsvall Hospital

In total hip arthroplasty (THA), radiographic preoperative planning and postoperative evaluation of acetabular component, femoral offset (FO) and leg length discrepancy (LLD) require good validity, interobserver reliability and intraobserver reproducibility.

Questions/purposes: (1) Evaluate the validity of the Sundsvall method of FO measurement by comparing it to a standard FO measurement method. (2) Evaluate the interobserver reliability and intraobserver reproducibility of measurement of FO, LLD, acetabular cup inclination and anteversion.

90 patients with primary unilateral osteoarthritis (OA) were included in this prospective study. On postoperative radiographs FO by the Sundsvall method, FO by a standard method, LLD, acetabular cup inclination and anteversion were measured. The interobserver reliability and intraobserver reproducibility were made by three independent observers. The validity and degree of prediction of Sundsvall method are measured by comparing its results with the standard method.

Study Overview

Status

Completed

Study Type

Observational

Enrollment (Actual)

90

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

    • Västernorrland county
      • Sundsvall, Västernorrland county, Sweden, 856 43
        • Sundsvall hostpital

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

  • Child
  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Sampling Method

Probability Sample

Study Population

90 consecutive patients with primary unilateral osteoarthritis (OA) who underwent THA between September 2010 and June 2012 were recruited into the study.

Description

Inclusion Criteria:

  • unilateral total hip replacement with either a cemented Lubinus SP II system (Link, Germany) or an uncemented CLS stem and Triology cup (Zimmer, U.S.A).

Exclusion Criteria:

  • Patient with secondary (OA), previous spinal, pelvic, or lower limb injuries or fractures were excluded.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

Cohorts and Interventions

Group / Cohort
Unilateral osteoarthritis
Patients operated with a total hip replacement due to unilateral osteoarthritis of the hip. Radiographic measurements of the postoperative radiographs.

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Leg Length Discrepancy
Time Frame: 1 week
LLD on radiographs was defined as the difference in perpendicular distance in millimetres between a line passing through the lower edge of the teardrop points to the corresponding tip of the lesser trochanter. The interobserver reliability was assessed from the measurements made by three independent observers.
1 week
Femoral offset (Sundsvall method)
Time Frame: 1 week
Measurement of FO using the Sundsvall method was carried out on the AP view of the pelvis as the horizontal distance (parallel to Hilgenreiners line) between the femoral axis (a line drawn through the center of the femoral shaft) and the mid line of the pelvis, at the height of the lateral tip of the greater trochanter. The measurement was performed bilaterally to compare the femoral offset on the operated side to the non-operated hip. The interobserver reliability was assessed from the measurements made by three independent observers.
1 week
Femoral offset (standard method)
Time Frame: 1 week
Measurement of FO with the standard method was carried out on AP view as the addition of the distance between the longitudinal axis of the femur to center of femoral head and the distance from the center of the femoral head to a perpendicular line passing through the medial edge of the ipsilateral teardrop point of the pelvis. The measurement was repeated bilaterally to compare the FO of the operated side to non-operated hip. The interobserver reliability was assessed from the measurements made by three independent observers.
1 week
Cup inclination
Time Frame: 1 week
Cup inclination was measured on AP view as angle in degrees, between a line drawn along the angle of rim of the cup and trans-ischial line (a line drawn between the most inferior point of the ischial tuberosities). The interobserver reliability was assessed from the measurements made by three independent observers.
1 week
Acetabular cup anteversion
Time Frame: 1 week
Acetabular cup anteversion was measured on lateral radiograph as the angle formed by the intersection of a line drawn across the face of acetabulum and a line perpendicular to the horizontal plane, according to the Woo and Morry method. The interobserver reliability was assessed from the measurements made by three independent observers.
1 week

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Investigators

  • Principal Investigator: Arkan S Sayed-Noor, MD,PhD,FRCS, Umea University

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start

September 1, 2010

Primary Completion (Actual)

December 1, 2013

Study Completion (Actual)

December 1, 2013

Study Registration Dates

First Submitted

March 29, 2014

First Submitted That Met QC Criteria

March 29, 2014

First Posted (Estimate)

April 2, 2014

Study Record Updates

Last Update Posted (Estimate)

April 2, 2014

Last Update Submitted That Met QC Criteria

March 29, 2014

Last Verified

March 1, 2014

More Information

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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