Clinical Trial: Radiological Riskfactors for Dislocation of Hip Hemiarthroplasty

Study Status: Completed
Recruit Status: Completed
Study Type: Observational

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

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 Summary:
Sponsor: Sundsvall Hospital

Current Primary Outcome:

• Femoral offset [ Time Frame: 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.
• Leg length difference [ Time Frame: 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 [ Time Frame: 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.

Original Primary Outcome: Same as current

Current Secondary Outcome: 1 year mortality [ Time Frame: one year ]

Original Secondary Outcome: Same as current

Information By: Sundsvall Hospital

Dates:
Date Received: April 28, 2014
Date Started: January 2006
Date Completion:
Last Updated: October 28, 2015
Last Verified: October 2015