Radiological Riskfactors for Dislocation of Hip Hemiarthroplasty

Completed

• Conditions: Dislocation; Femoral Neck Fracture

• Registration Number: NCT02131987
• Lead Sponsor: Sundsvall Hospital

Brief Summary

Between January 1 2006 and December 31 2013, at our department 324 patients underwent hemiarthroplasty (HA) for displaced femoral-neck fracture with a bipolar prosthesis (Variokopf, Link®, Germany) by the use of the posteriolateral approach. Patients with pathological fractures and HA performed with direct lateral approach were excluded. A retrospective cohort study were conducted. Patients with prosthetic dislocation formed one group and patients without dislocation formed the control group.

As standard, post surgery radiographs (anteroposterior and lateral) were taken. After these were performed patient started weight bearing as soon as possible. Clinical data regarding patient demographics, details of the surgical procedure and the medical comorbidities were collected by the use of patient and operative records. Radiological analysis with position evaluation was performed using the post surgery radiographs by measuring Wiberg angle, inequality of leg length and femoral offset of the prostheses and compared with non-operated hip joint using the post surgery x-ray images.

Our hypothesis were that patients with single- or recurrent dislocations had shortened postoperative leg length, decreased femoral offsed and a Wiberg angle less than 25 degrees.

Detailed Description

Not available

Study Timeline

• Study Start: 2006-01
• Primary Completion: 2013-12
• Study Completion: 2013-12
• Study First Submitted: 2014-04-28
• Study First Submitted QC: 2014-05-03
• Study First Posted: 2014-05-06
• Status Verified: 2015-10
• Last Update Submitted: 2015-10-28
• Last Update Posted: 2015-10-29

Recruitment & Eligibility

• Status: COMPLETED
• Sex: All
• Target Recruitment: 324

Inclusion Criteria

• Femoral neck fracture
• Treated with Hemiarthroplasty
• Through a posterolateral approach

Exclusion Criteria

• Direct lateral approach

Study & Design

• Study Type: OBSERVATIONAL
• Study Design: Not specified

Primary Outcome Measures

Name	Time	Method
Leg length difference	6 months to 7 years	Leg length difference is measured on the postoperative X-ray. The result are compared between the groups of dislocated and non-dislocated patients.
Wiberg angle	6 months to 7 years	Wiberg angle is measured on the postoperative X-ray. The result are compared between the groups of dislocated and non-dislocated patients.
Femoral offset	6 months up to 7 years	The femoral offset is measured on the postoperative X-ray. The result are compared between the groups of dislocated and non-dislocated patients.

Secondary Outcome Measures

Name	Time	Method
1 year mortality	one year

Trial Locations

Locations (1)

Orthopaedic department, Sundsvall hospital; 🇸🇪 Sundsvall, Västernorrlands län, Sweden