Distinguishing Acetabulum Cup Retroversion From Anteversion on Anteroposterior Radiographs After Total Hip Arthroplasty

Status

UNKNOWN

Phases

Unknown

Study type

Observational

Source

ClinicalTrials.gov

Registry ID

NCT04780100

Enrollment

Registered

2021-03-03

Start date

2021-03-31

Completion date

2021-05-31

Last updated

2021-03-03

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Orthopedics

Brief summary

In this study, investigators will demonstrate and prove a ellipse method (Liaw's version) for measurement and detection of acetabulum cup retroversion.

Detailed description

Total hip arthroplasty (THA) is considered to be the best and most reliable treatment of end-stage hip disorders with satisfactory long-term clinical outcomes. However,the incidence of postoperative dislocation ranges from 0.3% to 3% in primary THA. The most important risk factor is malpositioning of implant components. Generally, excessive anteversion and retroversion increase risk of anterior and posterior hip dislocation respectively. Several radiological methods have been proposed to measure anteversion of the acetabular cup on plain radiographs, but most of these methods cannot accurately distinguish cup retroversion from anteversion. In this study, investigators will demonstrate and prove a ellipse method (Liaw's version) for measurement and detection of acetabulum cup retroversion.

Interventions

None listed

Study design

Observational model

CASE_ONLY

Time perspective

RETROSPECTIVE

Eligibility

Sex/Gender

ALL

Age

30 Years to 90 Years

Inclusion criteria

* Patients undergone total hip arthroplasty * Patients undergone total hip arthroplasty with more than two postoperative anteroposterior radiographs of pelvis * Patients undergone total hip arthroplasty with postoperative pelvic CT

Exclusion criteria

* Patients with congenital pelvis abnormality or pelvic fracture history * Patients with postoperative periprosthetic fracture(s) * Patients with postoperative infection or implants loosening * Patients undergone total hip arthroplasty without more than two postoperative anteroposterior radiographs of pelvis * Patients undergone total hip arthroplasty without postoperative pelvic CT

Design outcomes

Primary

Measure	Time frame	Description
A computerized ellipse method (Liaw's version) for measurement and detection of acetabulum cup retroversion.	10 days	Total hip arthroplasty (THA) is considered to be the best and most reliable treatment of end-stage hip disorders with satisfactory long-term clinical outcomes. However,the incidence of postoperative dislocation ranges from 0.3% to 3% in primary THA. The most important risk factor is malpositioning of implant components. Generally, excessive anteversion and retroversion increase risk of anterior and posterior hip dislocation respectively. Several radiological methods have been proposed to measure anteversion of the acetabular cup on plain radiographs, but most of these methods cannot accurately distinguish cup retroversion from anteversion. In this article, we will demonstrate and prove a computerized ellipse method (Liaw's version) for measurement and detection of acetabulum cup retroversion.

Contacts

Primary ContactChen-Kun Liaw

chenkunliaw@tmu.edu.tw+886963969162

Outcome results