Radiological Riskfactors for Dislocation of Hip Hemiarthroplasty

Study Overview
=================
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.

Official Title
-----------------
Radiological Riskfactors for Dislocation of Hip Hemiarthroplasty Through a Posterolateral Approach as Treatment for Femoral Neck Fracture

Conditions
-----------------
Dislocation, Femoral Neck Fracture

Participation Criteria
=================
Eligibility Criteria
-----------------
Inclusion Criteria: Femoral neck fracture Treated with Hemiarthroplasty Through a posterolateral approach Exclusion Criteria: Direct lateral approach

Ages Eligible for Study
-----------------
Minimum Age: 60 Years

Sexes Eligible for Study
-----------------
All

Accepts Healthy Volunteers
-----------------
No

Study Plan
=================
How is the study designed?
-----------------

Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Dislocation<br>Patients operated with hip hemiarthroplasty for a femoral neck fracture with a postoperative dislocation of the prosthesis | |
| Non-dislocated<br>Patents without dislocation of a hemiarthroplasty for a femoral neck fracture | |

What is the study measuring?
-----------------
Primary Outcome Measures

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

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| 1 year mortality |  | one year | 

 Terms related to the study
=================
Keywords Provided by Centre Hospitalier Valida
-----------------
Dislocation, Hemiarthroplasty, Femoral neck fracture, Femoral offset, Leg length difference, Wiberg angle